We were at WDW 1/21-1/31 & thought both the morning & evening EMH hours were busier than during our past trips.
We did the EMH at AK in the am on 1/22 & 1/29 & both were great - not overly busy. We easily rode the Safari, walked the trail outside the Safari & rode Dinosaur before the park opened. There were virtually no waits during this EMH. We also checked out the AK EMH evening hours on 1/25 & were a little disappointed with it. It just didn't seem like there were very many attractions going & most of the restaurants/stands were closed - it took us 35 minutes to find someplace to get an ice cream snack.
We did the EMH at MK every morning & evening that they were available during our stay. These seemed busier than normal - maybe because there aren't as many morning hours at the MK anymore? Just before 9 am one morning there was a 30 minute wait posted for Space Mtn - we started to get in line & the line was backed up to the door.

We did easily finish all of Fantasyland during EMH, though.
There was only one early EMH at MGM & we did attend. Easily able to finish TOT, RNRC & the Muppets before park opening. We weren't able to make the evening ones here - although, we had wanted to originally.
We didn't attend any of the Epcot EMH - we intended to go to the evening one, but left by 8:30 because it was in the 30-40's that evening & we just got too cold to stick it out.
To us, the morning hours seemed much less crowded than the evening hours. I would definitely try to fit some of these EMH's in & try them out. Hope this helps!
