Except when it is... If you can edit fluently and quickly, _then_ coding is more of a nonissue, you're free to try things out, you can find and fix an error and Alt-Tab without blinking, you can harness this kind of physical flow of noninterrupted work, etc. I've worked alongside programmers for whom typing and editing were indeed quite the bottlenecks. Of course, any programming editor is probably good enough if you learn it.