If you are pretty comfortable dining alone, then pretty much everywhere is fine. I enjoy sit-down meals and book them either for lunch or dinner or both. I usually have a book with me, so that passes the time while I wait for my meal. I'm also pretty independent, so traveling and dining solo does not bother me. I love Le Cellier and the Rose & Crown in World Showcase, the Garden Grill in FW, Liberty Tree Tavern & the Crystal Palace at the MK, and Sci Fi & 50's Primetime at MGM. Oh, don't forget to dine at O'Hana's for dinner. The food is great!!! Below is where I'm planning on making PS for my upcoming trip for some suggestions.
CB Food Court
Concourse Steakhouse
Tusker House
Cape May Café
Liberty Tree
1900 Park Fare
Sunshine Season Food Fair
Rose & Crown
Rosie's All American
50's Primetime
Columbia Harbour House
Kona Café
Biergarten
Pure & Simple
Crystal Palace
Plaza Restaurant
Restaurantasaurus
Captain's Tavern
Garden Grill
ESPN
Rainforest Café
House of Blues
La Nouba
Hollywood & Vine
Sci Fi Dine In
Grand Floridian Café
Capn' Jack's
Le Cellier
Beaches & Cream
Cindy's
O'Hana's