We haven't eaten at any of the signature restaurants, so I may not be quite as helpful as some people. We've the only TS restaurants we've done at the resorts are Whispering Canyon Cafe and Big River Grille, and neither of those really scream "childless anniversary trip" to me. Out of the places we've eaten in the parks, I would recommend Be Our Guest (the atmosphere is spectacular, but I'd recommend eating in the West Wing or the Rose Gallery, which are much quieter than the Ballroom) at MK. At Epcot, we really enjoyed Les Chefs de France (though it can be noisy as well, and feels a bit cramped at times), but a friend of mine REALLY loved Monsieur Paul and said it was a more relaxing experience. My top recommendation is Coral Reef, though I know a lot of people don't like it. We had excellent food and excellent service when we were there, and the dining room itself is incredibly romantic; we went at an off time, and there were only a couple of kids, and the experience was much quieter than we expected.
