We always to the EMH no matter what time, what park, or what time during the year. Even if the park is packed its less packed than what it would be if everyone was in there though. We especially make sure we get to do the evening EMH......these seem to be less crowded than the morning ones and have a lot less kids, especially if its late EMH at Epoct. We've done that a few times and we were literally the only people (besides cast members) that were walking around World Showcase.
Upcoming Trips to WDW:
Dec 6-10: Disney Wonder
Dec 10-19: Port Orleans French Quarter