I'll add that you're guaranteed to get a private table if sailing concierge. They'll also try to meet your requests for one of the restaurants (such as "near the talking Nemo in Animator's Palate" or "teacup table at Enchanted Garden"). They can't necessarily meet all the requests because it's a rotation & your table will have a certain number, but they'll at least try to meet one request.
Thanks. Good to know. On the first part, this will actually be our first time traveling only as an immediate family and without extended family and friends so that isn't even something I was actually thinking about.