I've done the morning EMH a couple of times. I think it is a bit less crowded than the first hour at the other parks, however, in my experience, a park that has morning EMH is going to be more crowded the rest of the day. My take, if you have park hoppers, and you are willing to do that morning EMH, and then when the park starts to get crowded, hop to another park, it is probably well worth it. If you are not park hopping, then I would probably steer clear of morning EMH, and just do rope drop at another park.