I'm not exactly sure the GRRM point hold true. He might write on Wordstar, but the distraction free writing environment hasn't exactly helped him finish books in a decade.
There's also Stephen Bourne, who had initially programmed in Algol, and has a bunch of Algol-like macros that he uses when programming in C. I'm not finding an original source, though several references turn up.
Muscle memory is a real beast to change. The local optimum is always "stick to what I know".
