Backlot Express in MGM.
Tangeriene Cafe has indoor seating but no air conditioning---but usually manages to be comfortable, especially at night.
I think the counter-service in Germany is air-conditioned. It's way in the back and it's very dark, so if nothing else that would keep it cool. I'd never noticed how few of the WS CS places have it...but many are still worth it. Some do benefit from the air-conditioning blowing out of the shops.
Also in Epcot, Fountainview Bakery, although seating is limited.
Restaurantasaurus in AK? Just a glorified McD's, though.