Last year the Sunday before was not that bad. We were in the MK and it was an evening EMH. I found that we had many walk on rides, and we left the park around 9:30........way before the EMH times.
On Monday we went to DHS, which was also an evening EMH. I thought the crowds were light as well. We did take advantage of the EMH and found the crowds very low during them.
Now, Tuesday at Epcot is a whole different story.........you couldn't walk, literally, without bumping into someone. Fastpasses for Soarin and Test Track were gone by 11:30.........