The reason that morning EMH makes the whole day more crowded is that you have the people who are in the know, who came for EMH because they knew it was happening, then you have the people who aren't in the know, come to the park with no idea it was open early and then you have them added to the total # of people there. Also, people who don't have the park hopping option on their tickets get there for EMH and can't go anywhere else. For that matter same with the people who came later and can't hop, they're stuck too! I always remember not everybody is like my Disney addicted, no other hobbies self: they don't know about all of this and don't spend their free time analyzing crowds and EMH vs. no EMH. So they think, how nice to get a whole extra hour in the morning, what a treat not stopping to think about how many others will do that same thing. I agree with another poster, go to EMH early, stay a few hours then get of there and go to another, sure to be less crowded, park. And we always do late night EMH at MK, especially if its really late hours because after about 11:00 p.m. it will clear out with each passing moment. So same therory in reverse order. Do another non EMH park early, take a break then head to EMH at MK and stay until it closes.