If you are staying at the park, I've always thought park hopper is a must have. Especially with EMH. You can go to the morning hours at one park and then go the evening hours at another park (they alternate). For example, I'm going the 19-26 of this month. On the 20th and 25th, MK opens early in the morning. But their evening extra hours are on the 21 and 23. So if you don't have park hopper, you get miss out on this (I guess). Plus, if you are staying a six or 7 days, its difficult for me to commit to one park each day when you really want to do your favorites over and over again.