We went last year at the beginning of May. It was great. The weather was warm, but not miserable. The crowds were not bad at all. The only long waits were for stand by on the water rides, Splash Mountain and Kali River Rapids, but with FP it was a short wait. We never waited more then about 15 minutes for rides. The park hours are shorter, but without the crowds there is plenty of time to do everything you want. The only time it was really crowded was on a Thursday night when they had Spectromagic. The parade was only on Thursday and Saturday the week we were there, so MK was a madhouse that night. Now that my oldest is in school this year we are moving our trip up to the first week in June, I am going to miss going in May.