We were there 3/28 - 4/2 and totally agree about the crowds. We had to go at this time b/c DD and DS were marching with their band in Epcot on Fri. 4/1.
We expected large crowds, and did pretty well in the parks with planning and FP except for MK on 3/30. We got there around 9 a.m. and did OK until early afternoon when it got really crowded. We heard they had closed MK on Tues. 3/29 at noon. Not sure if they did Weds. or not. We went back to Pop to swim and rest before EMH and returned to the park around 7:30. They had everything roped off for the parade and were directing people to go backstage at Tony's. We walked behind all the stores on Main St. and came out behind the Plaza Restaurant. As the evening went on, the crowds just got worse. There was gridlock all around the hub after the fireworks, but it cleared out after awhile. Then the later parade started and the place became a mob scene. Apparently Disney had closed the backstage path and many, many people were trying to get down Main St. during the parade. We ended up having a very scary, very unDisney-like experience. DS (11) was so upset, he wanted to leave right away and skip EMH. We finally talked him into staying for awhile. Several CMs came and talked to us about what had happened and they were upset, too. Over the next couple of days, we heard from others about their experiences and many were similar to ours, but in different areas of the park. In general, the park was overcrowded and out-of-control.
We did stay for EMH for awhile and were able to do some things. Spl Mtn and HM were 5-10 mins., but at 1:30 am Buzz was 25 min. and Space Mtn was a 60 min. wait. DS never did get to ride it this trip.
Overall, we had a good trip, but I don't think we'll go back again at this time of year.