We were there April 2-11. The crowds were huge, we hit a few problems, but the trip was great. The 2nd and 3rd we did great crowd wise. Used FP and EE to our advantage. The 4th at MK was awful. The time change did me in.
The 5th was bad because I went to AK with my sister's SIL. She wanted to sleep late, then have breakfast in the foodcourt. By the time we got to AK it was about 11:00. They had a problem with the computers, so we were not able to exchange their 30 day vouchers for tickets, as a result 4 of the people in our group could not use FP.
(We were able to get the tickets that night at MK)
On the 6th we left the resort late and almost missed our breakfast at Cape May Cafe. By the time we got to MGM the park was packed and the lines were long. The sun got to my son. We were not having fun. That night I said enough. I told everyone I
was leaving the room on Wednesday morning at 7:00 heading to Epcot. If you want to come fine, if not fine.
From Wednesday to Sunday everything was great again. I took advantage of EE and used FP. The parks were still packed, and the lines long, but we were fine. My son, my niece, nephew and I hit the parks running. My sister and her husband would join us later.
My sister's SIL refused to get up early. Her and her daughter spent HOURS waiting in lines. They hated Epcot, but the lines were long and they didn't get to do anything.
After spending 70 minutes waiting in line for tower of terror, they felt it was boring.
I think you have to have a plan when you go. There's no way you can go during a major holiday without doing a little research before the trip.