We always do MK on Sundays. We get there at park opening and can get lots done. We have a young daughter so we usually hit Fantasyland right away and get all of those rides done because later in the day Fantasyland is a gridlock of people and strollers.
Yes, Sunday & Thursday is EMH for MK. It used to be Monday & Thursday. We went to MK on a Sunday last October (arriving for EMH) and it was still very peaceful.
I once read in a WDW guidebook that most people travel on Saturday/Sunday and start touring the parks on Monday. The park they usually start with? Yep, Magic Kingdom.
Debbie