We just got back yesterday from an adults only WDW trip. We've done WDW many times over the years, and I have to say, overall, I was not thrilled with Genie+/ILL's, etc. I'll try to make this as concise as possible.
A brief background: We have 4 kids, and the last time we went as a family was 6-7 years ago. We like to stay on site, preferably the Beach Club Villas. We would be there at rope drop, use a touring plan to hit all the highlights, then be back at the room around lunch for pool and rest time before hitting Epcot for one of the international restaurants. Since our last trip, I've also chaperoned 2 HS band trips, where we stayed offsite, getting our tickets each day the morning of, and usually not getting to the parks until 1-2 hours after opening but then are there until closing. Not my preferred way to see the parks, but we were still able to see/do quite a bit.
This trip we were gifted a condo at the Sheraton Vista for 7 days. Due to timing and school, we made it adults only with 2 sets of friends. All of us have done WDW with our kids, and we really just wanted to hit the highlights (Galaxy's Edge, Avatar, the Food & Wine festival) while getting some relaxation in by the pool and eating good food.
Two of us decided to become the Genie+ experts, which took way more research than I really want to do for a vacation.
I HATED having to either be awake past midnight, or get up before 7:00, in order to have G+ purchased in time to start looking for LL's. If there was a way to choose a later time than what was given, other than to refresh and hope for the best, I didn't see it. Then I hated that we had to do that all again at park opening time to hope there were any ILL's for the rides we'd really hoped to ride. This generally resulted in us getting mid-morning LL's, and only once getting an ILL, for early evening So much for a relaxing start to our day and having time out of the park to hang out by the pool.
I didn't mind using the phone to continue to use G+ during the day, and would generally just check it quickly once we tapped into the current LL. That worked well for HWS, though we NEVER had a chance at a ROTR ILL. Not so much for Epcot, where it would have had us running all over the park. For Epcot, we really just wanted Guardians and Remy. We got an estimated arrival time of 5:45 for Guardians with the VQ, and 2:30 for Remy after one refresh at 7:00am for Remy. Good thing we kept checking the times as our Guardians arrival time moved drastically, to hover around 2:15. We then spent quite a bit of time obsessing over it was going to move again, and barely made our Guardians time, with 5 minutes to spare, after hoofing it across the park. We really enjoyed Remy, and LOVED Guardians. Really, the best rollercoaster I've ever done. But with competing times, it was not fun.
Some of us ended up going back to HWS at 8:00 to just ride standby for ROTR, as that seemed the only way to ride it without waiting 2+ hours. We waited exactly one hour between entering the line and starting the experience. We agreed more than that might not have been "worth it" and that was from a Star Wars fan.
Epcot was stupid busy. We were there the night of a race and it's after party. We took the highliner from HWS, and the line to go thru the IG was 25 minutes long, stretching back to the entrance of the Beach Club. I'd love to know if that is common now or due to the race, as when we finally got to the front, we were told that non-race participants could suddenly move to a shorter line. It really felt like the CM's there had no clue what they were doing. The international section of Epcot was packed, body to body. Seriously not fun that night.
We had Space 220 reservations and just getting to the front of the park was a huge PITA. Space 220 was great, with some caveats. The food is good, and not cheap. We managed a somewhat early dinner time, which meant lots of kids were still there. So we spent a good deal of money, trying to enjoy our good food, while surrounded by cranky, loud kids. (Hey, I have kids, and it is Disney, I get it. But if you're looking for an experience to match the cost, this is a consideration.)
Staying off site, I had no idea until yesterday that only deluxe resorts get extended hours, and that they no longer deliver purchases to your resort. WTH??
So, we had a great time with our friends, and the G+ system mostly worked for us, though staying off site is a distinct disadvantage, so much so as to be punitive if your goal is the rides. It still galled me, though, that I had to PAY for that ability. If we'd been paying for our 4 kids on top of all that, it would be more galling yet. This system, if you want to ride rides, pretty much insures you will not have significant control over your schedule on any given day, and that you will likely spend a very long day in the park.
I didn't love that we had to reserve park days ahead of time, and hated that we couldn't park hop until 2:00. Again, no significant control of your day.
I probably won't consider another family trip to WDW for a good while. There is a long recent thread on if WDW is "worth it" now. For how we like to travel as a family, no. I can spend the same, or perhaps more, money on other trips, but know that I have control of what I'm doing that day, without dealing with the crowds, the constant juggling of our schedule, or trying to get fleeting chances at things we really want to do.