Oh everything is open but it is incredibly busy. Book a restaurant at the first opportunity or you won't get in. We went to Epcot on Thanksgiving and the lines were incredible - 3 hours for Test Track alone! We decided to be happy wandering around rather than riding. It was only that day that was worst - but whatever you do don't go shopping the day after. Black Friday is when all the stores go from the red to the black because so many people are buying up perceived bargains....