First time at Epcot? They won't know that the pizza at Via Napoli isn't as good as it was 8 years ago. But, they might enjoy talking to the wait staff about life in Italy and asking how they like the "Italian" food in Florida. Likewise, they may not like German food, but they might love listening to a live German band. Or, think about the first time you saw the inside of the Mexican Pavilion. There are quite a few restaurants in WDW that I go to, but not for the food.
The way I see it, if you leave the parks fairly early, it's easy to just stroll over, even for an hour. And you don't have to deal with long lines and Disney transportation--you'll do it more often because it's so convenient. WS is especially nice at night.
We stayed at the Yacht and Beach Club several times, and went to Epcot in the evenings. For us, it isn't something that we would do every time now---but, only because we've done it.
Another option is to split between going to Epcot and going to DS.