We went March 31-April 6 (parks April 1, 2, 4, 5). With Express Pass, basically everything was pretty much a walk on (granted, we did not do RRR or Hulk or Dr. Doom). We had to wait a few minutes once at Hippogriff and Gringott's (there were technical difficulties). That being said, some of the lines just take forever to get through. Gringott's just winds forever and then you have the pre-show and elevator ride thing and then more stairs and walking.
We did not get done what Touring Plans said we would get done on any day (we had three plans and just winged it the last day). Basically, we skipped all the shows (I had wanted to see the Harry Potter shows, Horror Makeup, and Animal Actors) and Fallon and F&F (also skipped pteranodon flyers because it was virtual line only, no EP); however, we sometimes did the rides more than once plus we did rider swap sometimes when we weren't expecting to plus we had the photopass so it would take time to get the ride photos. Also, waiting in line for food or snacks took longer than we expected (waited like 30 minutes for Seuss cotton candy because there are only 2 machines working at it takes like 10 minutes to make one fresh-my kids loved it though!). (Next trip, we are going to do sit down meals like Mythos or do a place with mobile order most of the time)
I did just talk to a family who went the same time we did and stayed PBH as well (randomly met them at a birthday party this weekend!) Anyhow, they felt like they waited a lot with the EP. However, their park hours were 2-9pm whereas we were 8/9-no later than 4. They were still glad they had EP, but I think hitting the early entry makes a difference as well. (I also wonder if the locals with the after 4pm Annual Passes with Express makes a difference). We also had rain jackets and just kept going with no issue in any rain and the rain was earlier on the days we went, so it might have shifted people to going into the parks later. It just seemed so crazy to me that they felt they waited so much when I felt like we didn't wait at all. (My 6 year old complaining in the 15 minutes we waited for Hippogriff makes me think we should never do Disney again! lol)