I can not comment on how crowded the parks are now, with EMH in the evening. But, we were their last May when they had the test run. And I can tell you that the crowds were not bad. And they did have Fastpass available for all the evenings that we had gone.
MGM, for ToT the waite time was 10 min. and RnR was walk on, and later 5 min.
Epcot, MS walk on, TT about 15 min.
MK, SM 10 min. BTM 10 min. Splash Mountain 10 min. Buzz 5 min. POC 10 min.