We are going to Epcot the day we arive. (April 29th) since we won't be ready to get the park until 5:00 and MK closes at 7:00. I am guessing that Epcot will be more busy then it normally would because of this. (no fireworks at MK so everyone will go over to Epcot.) The good news is Epcot handels laruge crowds well.
Saturday we plan to go to MK. I would think Grad night wouldn't be a problem at all since they will all be sleeping in the morning anyay.

We will do what we always do, leave when it gets too busy to enjoy. We have PS at Ohana's that night at 7:00 and MK closes at 7:00. I am little concerned about this, so I think we will leave MK in the afternoon, and then drive over to Ploy before 7:00 so we don't have to worry about transportation. (we have a rental car this time since we are going to Vero Beach for part of the week.)
Sunday we plan to do Mk in the morning again, then Epcot in the afternoon since we have PS for lunch ath Norway with some princesses! (1st time for that.)
I don't think it will be any more of an issue then any other trip. I think I will see lot's of those graduation hat's with Mickey ears on it. Come to think of it last year we were at Vero Beach last year the same week (1st of May) and didn't do the parks any, but did DTD and I do remember seeing alot of them.
Here is to going to WDW SOON! Now I have to start stressing overing paking. Oh wait, NO STRESSING this trip!

Oh well!