Unfortunately there is not much open past normal operating hours at DHS even during EMH. My family (for some reason or another) only really got to DHS at night, and we were stuck eating from Rosie's All American Cafe I think twice because nothing else was open past 8 PM (I think that's when the park closed when we last visited, so you'll have to check normal operating hours for the days during your trip!)
If you're going to be there earlier than that, you're okay, but just keep that in mind if you're busy riding rides and not thinking about dinner!!