When we went in August, it was a little extra crowded but not unmanageable. If you're staying for EMH, I would say keep the dinner reservation and do the extra hours. I might go somewhere else during the day and hop to Epcot for the evenings, but since you'll be there the first week in Feb., crowds shouldn't be a problem no matter what you decide.
The day after EMH was practically empty at Epcot, and the people there said that was typical for a day after EMH.