I've been using emacs for a couple of years now as my main editor, but I haven't gone past the 'casual' mode of usage - I haven't tinkered with the config file except for copy pasting stuff and never did try to create my own macros. I should try to incorporate that into my workflow very soon.

On a related note, Sacha's blog has been in my reading list since delving into 'serious' development mode six years ago. It also influenced me to try out emacs resulting to my love affair with it right now.