My opinion is maybe more emotion influenced than smart financial decision influenced... so just a warning. But hey, it's Disney.
My kids are 11 and 7, but we've been traveling to WDW since the oldest was 3 with usually at least a couple of stops per year at Poly CL so right in the zone of your ages. It was the resort/room type/resort experience that really got us hooked on WDW - just so incredibly convenient for parents with little ones at that age and totally worth it for our particular WDW style. WDW can be a grind with kids depending on your touring habits - CL adds just a bit of convenience to make it more vacation-like and take the edge off of all the running around, IMO.
Some random commentary in case helpful:
- The guaranteed Hawaii longhouse location can be a benefit... no longhouse roulette.
Hawaii is a conveniently located longhouse within the Poly grounds... steps to both pools, steps to the beach for fireworks or the Electrical Water Pageant. Forget the sunscreen back in the room? No problem, not a long walk. Oh and I don't mind if I grab a beer along the way in the lounge.
- Love having the CL breakfast as an option with little ones. Other food services during the day are going to be more small bites/snacks, but breakfast can absolutely work for most folks as a full meal. No messing with Capt Cooks mobile order, no worrying about where to get a cup of coffee. Breakfast service is one of the areas we really get value with CL, for us at least. If you're a "on the go, all breakfast meals in the parks" kind of family, then this will have less appeal.
- CL offers some basic beer and wine available upon request during the day and out in the lounge for evening service. Back when mine would still nap in the afternoons I definitely didn't mind having a cold brew (and goldfish, at the time) steps away.
- Don't drink? No worries - plenty of other beverages available all day and a coffee/espresso machine that makes a variety of beverages. Quick coffee to go before hitting the monorail? No problem!
- Personally, we prefer two fixed beds vs the villa bed setup. The double bathrooms can certainly be nice but didn't really resonate all that well with us - just so much space devoted to bathrooms. Of course that perspective may change when mine become teens. Lol.
- Also personally, we prefer the Moana themed hotel rooms to the more non-themed Villas. They are nice, no doubt... but to me the hotel rooms are more fun and whimsical. But to be fair - I have absolutely no problem with the Villas and would stay there without hesitation, these are just subtle preferences.
- While there's nothing earth-shattering about what CL concierge CMs can do... you just never know when you might have a small problem or situation that comes up - and having them right there in the building vs having to head back to the Grand Ceremonial House can at times offer a nice level of convenience. Magic Band not working? 3 year old isn't feeling well and you need to cancel your Garden Grill reservation? CMs are right there to help.
- The CL lounge is newly-renovated and (IMHO) is a beautiful space.
- While evening appetizers are not really meant for a meal, there are plenty of times where we've had a bigger lunch out in the parks and afternoon pool time becomes all afternoon/evening pool time and we just grab something light in the lounge. Easy peasy. As the evening goes on, get the kids bathed, PJs, maybe fireworks from the lounge or beach if they can make it, then beer/wine on the balcony/patio (make sure to request a third or first floor room) with DW while the kids go to sleep. Perfect ending to a Disney day, IMHO.
- To be fair, CL isn't all candy canes and lolli-pops... Poly CL is one of the larger CLs by guest count and is rather popular. The ebb and flow of guests during services (especially breakfast) can be real and is a comment you'll hear with relative frequency regarding the Poly CL experience. I could say the same for all of the CLs, but Poly tends to get it more just due to the room count there.
So anyway, TLDR, but maybe it helps. My ultimate conclusion - if you're OK with the splurge then maybe give it a try... if you're sweating the splurge and would rather spend money on other things, then that totally works too. Can't make a wrong choice, so that's good!