We were there over the past weekend and it was fairly empty. Saturday was obviously more crowded, we did AK and Epcot then, but still got to do everything we wanted. FastPass times usually were 45 min. ahead of when we got them. So if we got a FastPass at 1:00 we could go back at 1:45. Then on Sunday we did MK and MGM. MGM was so empty we did RnRC 9 times.
I don't know if this was due to Mother's Day or time of year, but either way we got our fill.
The only rides that had a substantial wait were Splash Mountain, BTMRR in MK and Kilimanjaro in AK.
You should be okay. It was humid though. I live in Houston, and it was humid for me.
Enjoy your trip.