We're doing some EMH morning this summer when we go. Just at Animal Kingdom, and the second day we go to Magic Kingdom. When we go to both Epcot and the Studios, the morning EMH are the day before so I am anticipating somewhat less of a crowd, but who knows...it is summer and busy season.
Here's what I figured...the day we arrive, we will head to MK around lunchtime when we get there (and there are no EMH at all that day)...Epcot actually has the EMH that day. We are heading to Epcot the next day for park opening, which is the same day there are EMH at the Studios. Since we are doing breakfast at 8:05 at the Studios anyway, we can't take advantage of morning EMH attractions before regular park opening, so we figured avoid the crowds instead and get into the park early anyway for our breakfast. AK is morning EMH and the last day there are morning EMH at MK so we are taking advantage of those. This is our first family trip to WDW, and both DH and my first trip staying on property. SO we are "experimenting" a little to see how it works out and keep it in mind for future trips. Kids are really little so we are not even worried about evening EMH yet!
Enjoy your trip!
-Bonnie