Hi! Artist's Point at Wilderness Lodge is really nice, delicious food. DF and I are partial to this one because we got engaged at Artist's Point in Yellowstone Nat'l Park (view of Lower Yellowstone Falls).
Brown Derby in MGM is world class food, some tables are somewhat close to other diners, maybe not that romantic.
We also enjoyed LeCellier in Canada at Epcot. Same as BD, some tables are close to other diners.
Check out the restaurants page. People rave about some of the places in Grand Floridian but DF and I have not been there....YET! Have fun and enjoy your romantic dinner, wherever you go!