I tell you what -- you've inspired me to start a blog and write about this! Will post here when I get it up and rolling.
I can tell you a whole bunch of questions I‘d have as someone who considers himself a pro user and who‘s been hearing about Vim and Emacs a lot, hears the „calling“ of greater productivity and ergonomics and an improved human-computer-interface, but has never quite been able to take the plunge.