[aphelion]

It's not particularly surprising when you think about it. Users of stenography keyboards are far more "productive" than users of QWERTY keyboards. But everyone knows how to use the latter at some level of competence, while the latter requires extensive training in specific skills. And really, do you need to be able to type 200 WPM?

In the same sense, vi or emacs might make you more productive in the limited sense of typing code, but only after you've taken the non-trivial amount of time required to obtain a level of proficiency with them. And even then, being able to type and edit code more quickly than someone using a more traditional text editor is only a small fraction of what constitutes performance for a developer or designer.