I would second the World Showcase idea. Personally, DGF and I love the San Angel Inn, not so much for its food, but because we find it romantic. The whole Mexico pavilion is romantic to us. Then a stroll around the lake stopping in and seeing fun things in each country as we please. The WS at night is beautiful.
Also, Liberty Square and Frontier Land in the Magic Kingdom are lit up very romantically at night and DGF and I love to stroll around there in the evening. Favorite place in the parks to be, in my opinion. So if you can get a decent dinner around MK, and head back into the park afterwards you can stroll around while it's cutely lit, and then get cozy for Wishes.
If you're going in January, it may be chilly in the evening, so cuddling might be a necessity.