We've been there a few times with varying levels of interaction. It really does depend on how you present your party. For example, I went with my father-in-law, mother-in-law, and an aunt-in-law. None of them really wanted to be there (maybe my father-in-law but the other two ladies were NOT into it). We were totally left alone. And once I was miserable because it was summer and I was in a neck brace so my husband and I were left alone.
However, there have been times when we've been in great spirits and it does show. We were there with a vegetarian friend from Utah. "Mom" asked us where we were all from and when my friend mentioned her state, "Mom" sat down and whispered that she once got a speeding ticket in Utah and didn't pay it so we wouldn't tattle on her would we? Then when we gave our orders, my friend ordered the turkey sandwich without the turkey. "Mom" did a double take, we explain the vegetarianism so "Mom" rattled off three or four veggie choices that were not on the menu. That was nice.
Our last trip, I was scolded by a different server because I was looking over at a couple at the next table and I was told not to stare. I've been called a princess for ordering a margarita. Another time, another friend was made to wear a bib because he spilled his milkshake (his two elementary age girls LOVED that).
And the absolute best was when a little boy asked a server for directions to the bathroom. I can't remember the exact words but it was to basically go out the front door, turn right, go down Hollywood Boulevard, out the front gates, take the boat over to Epcot and they should have some there. The look on the boy's face was priceless. Then the server said "or, you can just go down the hall."