We arrived last Thursday and left yesterday afternoon and I was terrified about crowds before the trip. We had a group of 16 for 4 nights and then we were a group of 7 for the last 2 so I knew it would be a challenge moving us all through the parks. The most unpleasant WDW trip I've had was during March several years back so I always try to avoid the spring break/Easter season but it could not be avoided for this trip with extended family.
It was definitely crowded and required some planning and adjustments but had a great time and didn't find it unpleasant at all. Part of our crew landed at 5:45 pm on Thursday evening and arrived at the hotel around an hour later. We managed to get them to our villas to freshen up and drop their bags, hop on the Disney bus from Kidani (I had considered taking Uber to speed things up) and we still managed to ride the Safari and Navi River (both with FP) Everest twice, Kali River Rapids and stop to eat pretty leisurely at Flame Tree before the park closed at 11:00 pm. We could have also gotten on Dinosaur at the end of the night if we wanted but no one felt like walking over that way after a long travel day.
Despite my best efforts, I can't get this group to do rope drop as a whole (a small group of us did rope drop to get on FOP on Sunday morning but that was it) and we took time to have leisurely sit down meals (Tutto Italia, Hollywood and Vine Seasonal Dine, Chefs de France, Boma for Easter Brunch) but we still managed to get on almost every thing we wanted to do during a short trip (half of our group arrived Thursday night and left on Monday morning - the rest of us stayed and had more relaxing pool days at the end.) We also stopped a lot for snacks, coffee breaks and drinks. The only things we didn't manage to do that I wish we had were the Mine Train and Test Track and we probably could have fit both in if we were willing to wait. In one day at MK we managed to fit in Space, Splash, Mansion, BTMRR, Mermaid, Small World, Dumbo, People Mover, Pirates, Magic Carpets, the regular train, Peoplemover, HEA all with a break to go to Epcot via the Boardwalk where we also stopped to get some ice cream.
I will say that I noticed the crowds seemed worse on our final couple of days. I went over to DAK for a few hours on Monday and the lines at Pizzafari were nuts and we had to trek over to Africa with our food to find a place to sit and eat outside Tusker House. We did a little monorail resort touring before we left on Wednesday and the MK area did seem busier than when we had been there earlier in the week.
We never waited very long for buses or for security/turnstile lines and we never really found ourselves in those hellish looking crowded walkways. The buses themselves were also never TOO crowded. The previous trip I had taken during spring break season was honestly unpleasant to the point where it was not nice to be in the park at all even if you didn't care about going on rides. It was the only trip where I ever just said "Forget it!" and left a park before I had planned. This past week was not close to that at all even though it was quite busy.