I just got back from my trip and did EMH at 3 of the parks on 4 different nights. i was dreading EMH at MK based on what i had read, but wow, it came in handy for me. here's what i saw re: wait times and what times i saw them at:
June 12th:
MGM; park closed at 10. went to 10:30 Fantasmic. Came back out a little after 11. 45 minute wait for the Great Movie Ride. Went over to Voyage of Little Mermaid and walked right in. Back to GMR and waited 30 minutes.
June 13th:
MK; park closed at 11. Saw Spectro from near the castle, headed straight back to Timekeeper to get wristbands. About 8 minute wait for Buzz. Then we ate at Cosmic Ray's and headed back to WL
June 15th:
Epcot; Park closed at 9; Watched Illuminations, got wristbands immediately afterwards. went to Land for dinner; from 1o to 11:30ish, it fluctuated between a 45 and 60 minute standby wait for Soarin. left and walked right on to spaceship earth.
June 17th:
MK again; park closed at 11; got wristbands around midnight from timekeeper again. headed straight to fantasyland. about 8 minute wait for Winnie the Pooh, walked on Small Word, 25 minute wait for Peter Pan, about 5 minute wait for Mickey's PhilharMagic.
Best advice: Don't get wristbands before EMH start! Every time we went to get them it was massive, winding lines. When we waited until right when EMH started or a bit after, there was no lines. Hope this gives you some idea about wait times, even if it's not for all the attractions.