I've written and edited plenty of runtime configuration files, but there is this to say for GUI preference panes: you don't need to bother with learning a new language, even a simple one, for every other program. Set it up, and then use it. Maybe occasionally define a new text snippet.

I know many heavy users of editors and IDEs who are by no means power users, with their dotfiles on version control and everything. There is a distinct difference. In all honesty, I don't think either group is more productive than the other except on a very micro scale.

It is, however, a perfectly valid preference to have.