We're celebrating our 5th aniversery at Disney as well (well a couple of days late since we decide to go a week after our aniversery for
free dining). Some of the restaraunts we chose for more romatic meals were:
CRT last possible reservation we could get so we could see the fireworks go off around us as we ate in the castle, though the food quality here is not top of the line there is just something romantic about eating in the castle.
Jiko, Flying Fish and Artist Point, all three of these restaraunts are signature dining so they are a bit "nicer" then some of the other restaraunts we are eating at. They all have good steak and the Jiko filet with mac and cheese is supose to be amazing. Artist Point is supose to have a really nice buffalo steak as well.
Le Cellier is a steakhouse, all the reviews I have seen say it is top of the line for food, with various choices for steaks. It is not the most romantic meal we've chosen, but it should be good steak (for me at least hubby can't eat meat so veggie meals or fish only for him).
Another place that might be nice is going for dinner at California Grill during Wishes, though it will probably be more crowded with kids. Seeing the fireworks from there is apparently really nice though and they are supose to have decent steak as well.