Not quick enough. I think faster than I type, and I type fast. It's fine until I start getting impatient with myself. Call it micro-impatience, a flash of irritation in which you're suddenly conscious of not having finished typing in the thought. It's distracting.
Honestly, I like parent's idea; a good chunk of Emacs's awesomeness and the reason people like me use it as an operating system is because of that - unified, fully configurable and expandable text-based interface. I often wish to have something like it system-wide, because standard UIs are very far from optimum ergonomy-wise. But then again I wouldn't trust Apple or Microsoft to do it right; they'd quickly find a way to dumb it down, or restrict the extensibility in the name of security.