This works for my partner and me:
We love the Epcot Resorts area. When we want to have a "date night" experience we start off with cocktails at the Belle Vue Lounge at the Boardwalk Inn (it's been our experience that it's USUALLY one of the quieter (less kids) lounges at WDW), then we stroll over to the Dolphin for a fabulous lobster dinner at bluezoo, then we walk over to either Jellyrolls for a couple hours of raucous piano/sing a long antics or Kimonos for karaoke (depending on our mood). Then we cap things off with a complete stroll around Crescent Lake (with a stop or two at one of the many benches around the lake for some PDAs (family friendly, but usually by then it's pretty deserted) , then we return to our room at whichever Epcot Resort we're staying that visit.
We find that each of the deluxes and moderates has areas that are conducive to romance.
My sweetie and I will be celebrating 25 years together next month at the World.