We were there the 10th - 15th and thought it was quite warm. The humidity did not seem that bad to us. Crowds very minimal at Epcot and MGM, but we hit some crowds at MK on Friday and AK on Sunday. MK Fantasyland was a zoo in the afternoon - 40 min for Peter Pan, etc. (glad we hit most of it early). At AK, you could hardly walk through Africa, but the rest of the park seemed OK. This was our first May visit so I don't have much to compare it to. We noticed that wait times varied a lot based on the time of day. We saw walk-ups turned away at most of the table service restaurants. Transportation was efficient.