Just got back from EMH a few minutes ago (sunday night/monday morning). Crowds were not bad at all. Right after Spectro and then right after Fireworks, groups of people were leaving. EMH hours were from 10:00pm to 1:00am. We left around 12:30.
In that time, we were able to hit BUZZ 4 times (about 5 minute wait each time), Space Mountain, Orbiter, and TTA all in Tomorrowland. Jumped over to Frontier/Adventureland and rode Aladdin, Jungle Cruise, and POC all without ANY wait. Went over to Thunder Mountain and Splash Mountain (got wet, and it was a COLD night!), and then just walked around for a few minutes.
As you can see, we were quite productive, and the it was all due to EMH. Largest line of the night was at SPace Mountain, and that was because it broke down at least twice today, possibly more.
Feel free to ask any other questions.