Biggest change for us was the amount of time we spent with guest services! We just let our APs expire due to the trouble it's been. I'll focus on the days before we were averaging 45-60 minutes getting things "fixed" each weekend.
Epcot was interesting. We started eating breakfast at the park, knowing Soarin was covered for just after we finished. That was nice. I did shop more, earlier in the day. Disney made a little more money from us and it felt more relaxed. However, we only bothered with Test Track once after FP+ began. Huge negative. That one time, we spent thirty minutes in the fastpass line. Sure, there were probably other issues going on that day, but it wasn't worth skipping a ride the entire family could do to try again. Rushing for this at rope drop was never going to happen. We always had fastpasses that went unused here.
I can't decide if I liked FP+ for DHS or not. Having TSMM covered was pleasant, especially when we only went in the evening to see the Osborne lights. It was great during Star Wars weekends, too! Unfortunately, the planning ahead sucked for regular visits. Before, we could decide to go over to DHS the night before. After, TSMM would be gone days in advance. Whatever Disney made in our new morning purchases, they lost more on those days we didn't bother going at all. We were also always at our AP FP+ limit, as I had days planned just in case we went. I did cancel if plans changed, but this was a ridiculous game.
MK was fun and I mostly liked FP+ here. We have a bit of a routine in this park, so it was easy to adjust. We didn't really do any more or less here. My family was fine missing the big stuff when it was gone, so that really helped. It was awesome for a spur of the moment visit last month. We decided at noon, and I was able to see what was available before jumping in the car! (We're in St Pete)
I have to bring up that time at guest services again though. Miserable. We had so many issues with bands at resorts and in the parks. I listened to so many explanations and resolutions that went nowhere. It was fun hearing how it must be my fault each time, too. My phone number is on the account too many times. My family isn't entering the fastpass lines in the correct order. I have too many bands. My one month old band is too old. My resort expectations dropped to hoping just one band might open the door. By the end, I started getting nervous whenever we approached a fastpass line. Will it work? How will the CM treat us if it doesn't? They seemed to assume I'm lying when it didn't work. It's embarrassing and stressful. How much time will we spend getting it fixed this time? That was the biggest way FP+ changed our touring! I do love Disney, but we're taking a long break.