Just back, we were there Friday through Wednesday (3/1). I have to echo the other user's post - MK emptied out after parade and fireworks. From 11pm to 1am, you had no more than a 10 minute wait for any of the popular rides. The only issue was that since we stayed there until 12:30, that killed early EMH at AK the next morning.
So, plan your combinations - late vs early EMH. It's tough to do both.
MGM was much more difficult. We went straight to the RNRC FP booth at 7pm, and when they opened at 7:07, we got FP's for 7:45 - 8:45. We made it back by 8:30, and the FP's were all gone. Wait time was about 30-45 minutes at that time. Didn't go by TOT. Honestly, at MGM, once you eat and ride RNRC at MGM, there's not a lot left to do. Only 8 attractions are open. IF you are a TOT fan, then that's 2 attractions. We had done all of the others, so we just did a couple of extra RNRC rides, and left.
never made it to AK EMH.