Congrats on your pending "Disneymoon"!
Cinderella's Royal Table is a very nice romantic spot...what's better than eating in Cinderella's Castle, right?! I would definitely recommend advance reservations (90 days in advance). It books up quickly.
Another terrific place (among the masses) is California Grill at the top of the Contemporary Resort. They have a great view of MK and the food is wonderful, albeit expensive. While you're waiting for your food, you can walk out onto a "platform" of sorts that overlooks MK and the lagoon. We really enjoyed that. Again, I would HIGHLY recommend advance reservations.
Good luck!!