We just got back on Sunday. I did not find the crowds to be that bad. We arrived on Wed. and headed to Magic Kingdom around 5pm and stayed to close(9pm) The only long wait we had was about 25 minutes for the Speedway. We used fastpass for Buzz and then walked on Pirates, Haunted Mansion and Aladin. Fantasyland was a little crowded, so we decided to do that during EE the next day. We did EE on Thurs. We did all of Fantasyland and rode Buzz, Speedway, Pirates and Haunted Mansion by our noon PS. We got a fast past for Splash and did that after lunch. We headed back to the Poly. at about 2:30 and spent the rest of the day by the pool. We went to Disney Studios on Friday morning. We were there for the opening. Everyone made a mad dash for Tower of Terror and Rock and Roll Roller Coaster, the rest of the park was empty. We did Great Movie Ride, Little Mermaid, Indiana Jones, Muppets, and got lots of autographs by noon. We headed back to the resort for swimming and a nap. We went to Epcot that night and there were very little crowds. We hit Animal Kindgdom Sat morning. We did Kali Rapids, the safaris, Lion King show and TTBAB, and dinoland(minus dinosaur) by noon. We went to MK that night. It was a little more crowded because it was the only night for Spectro. My boys decided that they didn't want to see the parade, so we were able to do all the fantasyland rides with no wait during the parade.
It was less crowded then I expected. We went the beginning of May a few years ago and I thought the crowds were about the same. It was really HOT though. We had a cool summer here in Chicago, so my boys were not used to the heat. We found that as long as we went to the parks in the morning or evenings we were fine. By the middle of the day it was just too hot to be there. I was really suprised by all the people that came into the parks between 10-11am. If you go early, you can get a lot done.
As far as the rain, it sprinkled a little Wed. night and then it didn't rain again until Sat. around 3pm. There were very heavy showers, but it was only sprinkling when we went around 5pm.