My most romantic dinner on my honeymoon, has to be hands down, the castle (Cinderellas Royal Table). Maybe its just because i'm a princess at heart, maybe it was the table by the window, that we sat and watched the fireworks from. Maybe it was the fact i wore a dress to dinner and didn't feel out of place at all. But really i think it was the handsome prince across the table from me, so really every dinner was special in its own way.
Enjoy your honeymoon, we certainly did. (Note, if you like wine with dinner, or other alcoholic drinks, the magic kingdom is a DRY kingdom).
We also did the rose and crown at epcot and sat on the patio and watch illuminations there, that was slightly more 'magical' then the castle because we walked up and asked if they had anything available, they were going to seat us inside but the table wasn't ready yet.
Other dinners that rate high on romance for our honeymoon:
Eating standing up in the pouring rain at Blizard Beach because that was the one thing my husband really wanted to do (a water park, not waiting out the rain).
The first night at Whisper Canyon at WL, they seated us right next to the fireplace.
I also enjoyed (but my husband not so much) breakfast with the princesses, but the special surprise treat of doing that is walking thru the parks all by yourselves when they are completely empty. I got some great pics and found it very romantic. Likewise if you stay for an enight (or just the bitter end anynight) walking thru magic kingdom and watching the goodnight kiss is truely magical. (especially if you just happened to get a picture with both minnie and mickie, which was the only char picture my dh would be in with me (because it was late, and we weren't depriving any childern of the chance))