I do believe MK and HS is done for Christmas. I thought the first mickey Christmas party is a few days earlier. Don’t know about Epcot.
The parks do close early, but I don’t think any earlier than now. But the weather is cooler (not cold), so you can march around all day and not pass out from the heat.
So use those vacation days. I’d pack peanut butter and jelly if I had to do a trip cheap or no trip. Eating out is nice, but I can eat out around here. Disney is nothing like around here.