Lennon on the early Beatles stuff
Harrison's 12 string because he liked the Byrds
Tom Petty's 12 string (pretty much to emulate the Byrds/Beatles sound)
John Kay of Steppenwolf
Joe Walsh has used one live for slide at least (can't remember is he used it for other stuff live)
Basically, Rick was the sound of the English invasion of the early 60's. The Lennon used one and the Rick people jumped on that. They had a very successful marketing department and when you combined that with Beatlemania, they couldn't lose. Later, when the Beatles switched guitars looking for new sounds, Ricks weren't cool anymore. Yesterday's news. Time and tastes change.
If the Next Big Thing breaks out using Ricks, it'll start all over again.