I just returned from a trip May 5-12 and found the crowds very manageable. Maybe a little heavier than my usual time at the end of January, but not bad at all.
Sun., 5/6: MK, arrived around 2 pm, had minimal waits for most rides, had to FP SM, stayed for PM EMH and walked onto most rides
Mon., 5/7: EPCOT used FP for Soarin' and TT, but most others were minimal to no waits.
Tues., 5/8: MGM used single rider line for RnRC, got FP for ToT but didn't need it..there was absolutely NO WAIT all day long...we even walked on at 7:30 pm. Lines/crowds here were very light all day.
Wed., 5/9: AK walkways were crowded but lines were not bad, except for KS had 45-60 min waits all day and FP return ~2 hrs later. I think this was due to the fact that one loading side is closed for rennovations. There was a note on the map that they are not running FP for EE during the week...I don't know if this is just for May or what...but used single rider line with no problem. Walked onto Dinosaur multiple times. Stayed for 1 hr of PM EMH, but had to leave for Cirque at 9 pm.
Thurs., 5/10: day at the beach
Fri., 5/11: MK in AM for early Crystal Palace breakfast, afterwards went straight to Fantasyland and got FP for PP, rode IASW, Pooh and PhilharMagic with minimal waits, everything else was minimal wait, got FP for Buzz around 1 pm with return time ~40 min later. Left at 3:30 pm for break in room then went to EPCOT in PM for EMH. TT and Soarin' had 45-60 min waits, TT was down for all of EMH :-( everything else was a walk-on...rode Soarin' at 11:45 pm with no wait.
Overall, the weather was great...hot on Sun., but cooler most of the week until Sat. Only one afternoon thunderstorm.
The crowds were not bad, though the day at AK and the last day at MK/EPCOT seemed more crowded than the others. The PM EMH we did seemed crowded at first, but cleared out pretty quickly and were empty by the end. (We didn't do any AM EMH this trip.)
Poohbear