I have been researching this topic for the past several weeks. It's more complicated than you might think...and I've attempted to analyze and summarize what I've read to develop our itinerary. I've tried to combine all the best advice from the boards with what the Unofficial Guide says, and this is what I've come up with:
1. Morning EMH is worth using at MK if you can hop to another park around 10:30 to avoid the extra crowds AND if you are particularly interested in the attractions in Fantasy Land and Tomorrow Land (these are the only ones open).
2. Morning EMH is not worth using at EP, MGM, and AK unless you are particularly interested in the few attractions available. Again, it is advisable to hop to another park when the crowds arrive.
3. If you plan to use morning EMH, you need to be there when they open the park (actually, this applies even when you're not using morning EMH and are visiting on a regular day).
3. If you are not interested in using the morning EMH at a given park, don't want to leave at 10:30, or don't have the hopping option, go to another park - preferably one that is not having evening EMH either. However, some people have said that evening EMH doesn't seem to affect the crowd level in that park in the a.m.
4. Evening EMH is only worth using at MK in the slow seasons OR if you can stay until the last hour (crowds thin substantially then). Apparently, at peak times evening EMH can be packed at MK.
5. Evening EMH is always a good option at EP. Evening EMH at MGM or AK is "iffy" depending on the season.
6. A good time to visit a park appears to be the morning after they've had evening EMH.
So based on these principles, when we go in May we will do the following:
1. Go to MK on morning EMH days and hop to a non-evening hours park at 10:30.
2. Visit the other parks on their Unofficial Guide "best day" or on "morning after" days and be there at open.
3. Stay for evening EMH at EP only.
Of course, our plan is based on our particular needs with a young child. We want to do Fantasy Land extensively but we don't care about riding most of the "big draw" attractions that are open at the other parks on morning EMH.
Big Disclaimer: This is based only on what I've read in the Unofficial Guide and in the discussion boards. Although I've based this on what it appeared that the majority of posters were advising, I may have something wrong! Please correct me if anyone sees that one of my conclusions is in error. I promise I won't be offended...this obsessive/compulsive project of mine is a work in progress! I know I'm a big nerd for being so detailed and meticulous, but I can't seem to help it...
