[Nimbus]

As the others have said, I'd hold off making any definite plans at the moment. Maybe think about it more at the beginning of May?

If you want to visit GE then, clearly, you're going to need to buy at least some sort of ticket. Probably a 1 day ticket. Maybe an After Hours ticket is those are announced for the dates you are there. But you'd have to wait and see about that. I personally wouldn't book 1 night at an on-site resort. As sha9 says, it doesn't give you a huge advantage when it comes to booking fastpasses.

At the end of the day, if you plan only to visit on 1 day then you have to live with the probability that you may not get to go on all the rides. Instead, you may have to do them on your next trip when you might concentrate on Disney rather than the other parks.