My husband and I were recently at Epcot & shared a meal at Coral Reef. I even told the waiter upfront that we had a discount. We ordered 1 appetizer to be served with the 1 entree that we ordered, and told him that we would be sharing them. They brought an extra plate for the shared entree, and we divided the appetizer between our 2 entree plates. It was not an issue at all.
I think that sharing is a great way to enjoy a lot more dining opportunities, not just saving money. Also, many entrees are way too much food for 1 person to eat, and still feel comfortable. Counterservices, snacks, drinks, etc all are great ways to share without over doing it. (and it's also more fun, I think)