We came back on the 10th- we had a great time! It was crazy hot, which I didn't expect for some reason. Really low crowds- we had 10-15 minute waits for most things, with the exception of Soarin' (50-60 minutes both days we checked it out), Splash Mountain (50 minutes) and Toy Story Mania (maybe 30 minutes? I don't remember). We did walk on to a lot of things too- Tower of Terror on May 4 said it was a 20 minute wait, but DH walked on pretty quickly. Even only a 20 minute (or less) wait for Everest on mother's day. We did use rider switch when necessary, but only Fast passed once for Peter Pan.
I still will probably not go again outside of the fall (dang it was hot!), but it was definitely an enjoyable trip. There were more people than I thought would be there, but few waits, so it was okay. I am curious how the MK was on Mother's day- we didn't go that day because I thought it would be the most busy.