I love evening EMH! MK is the best, because it's so late. I'm a night-owl by nature, have to make myself go to bed early so I can get up and be at work by 8am, lol!
But, when I'm at WDW, I'm energized! I can get up early and stay until they close it down. My kids hang right there with me; one time, when DD was still at home, the MK closed at 2am. We had just come off of BTTM when they closed and it felt like we were as far from the exit as we could be. It wasn't crowded at all and as we walked from Frontierland, through Liberty Square, using the Castle as our beacon, we were pretty much the only people left. We passed an occasional CM, and a few maintanance people, but not many guests.
It was kind of eerie, but we still talk about how cool it was to have the park pretty much to ourselves. It felt like we were 'tucking the MK in' for the night, lol!
I always plan on evening EMH when we're there and love every minute of it! As for morning EMH, not happening!