I would head over to the Solo board - there is lots of info about dining alone and suggestions. Personally, since I travel so much, I eat alone a lot and enjoy it. In DTD I like Wolfgang Puck (any of the options) and House of Blues. I don't really eat at DTD much, nor do I do character meals, etc unless I have kids with me.
I highly recommend some of the resort restaurants as well, with Yacht Club Galley, Spoodles, Yachtsman Steakhouse, Concourse Steakhouse, tea at GF, all being dependable, solid choices.
Rarely do solo's report poor service due to being alone, although some complained that 50's Prime Time servers do not get into character for solos. I have sometimes had trouble getting a PS when asking for one person, but changing the requet to two people finds space! (That one I can't explain, there are no single diner tables!)