I like the feel of the San Angel inn in epcot the most, however the food is your standard Mexican fare. If you have a great place in your home town, you may not LOVE it. However, it isn't *bad* by any means...just not amazing.
However, Le Cellier is AWESOME FOOD! And a quiet, cozy restaurant, with dark furnishings and a calm air. You can ask for an out of the way table.
Another good option is Artist's Point at Wilderness Lodge. This however, is the priciest of them all.
All 3 are on my list of romantic meals.
If the *feel* is the most important: Go San Angel Inn.
If the *food* is the most important: Go Le Cellier.
If the *experience is most important AND worth the extra money (nearly double the cost of the other two)*: Go Artist's Point.