We always try to take advantage of the morning EMH. In our experience, the parks are not that crowed. We have a plan of attack as to what attractions we want to see. When we were there in May, we did the morning EMH at all the parks. It worked out great for us. At the MK, we did all of Fantasyland by 9:30 and was ready to head off to Toontown. At Epcot, we had one member of our party run over to Test track to get fast passes and the rest of us went to Soarin. There was only a 10 minute wait. At the AK, we were in the mob of people that headed for EE. Instead of getting in line right away, we got our fast passes for EE, then got in line. We rode EE, then headed over to do the safari. We rode EE later in the afternoon. We used the same plan of attack at MGM esp since the ToT and RR are so close together.
We did two EMH. We did MGM first and we did not go to the park until 10pm. It was not as crowded as we had expected. However, there was a lot of guests that did not have a wrist band on and they were riding the rides. We also did MK, and it was more crowded. Again, we noticed a lot of guests without wrist bands. For our next trip, we will do the morning EMH, but we are not sure if the evening is worth it.