I realize that the editor war has passionate individuals on both sides of the fence, so I'll choose my words carefully.
In terms of Emacs versus Vim, I'm agnostic. It seems like as long as you're not doing the hand-on-mouse-hand-on-keyboard dance then you've solved the Editing Problem. Maybe some people have become super-productive after switching from one editor to the other, but it seems rare.
Personally, I was introduced to Vim a couple years ago by a coworker. I liked the idea of never using the mouse while editing, so I memorized the new workflow and haven't looked back. There are two reasons why I haven't been interested in switching to Emacs:
1) The Vim key bindings have been burned into my brain over the course of two years. I even close popup dialogs by accident sometimes, because I often press the ESC key after typing anything.
2) The ViEmu Visual Studio plugin ( http://www.viemu.com/ ). As far as I know, there isn't an Emacs equivalent. And yet, even if there were, why switch to it? The value is in the ability to not take your hands off the keyboard, which the Vim key bindings already provide. So that would simply be trading one set of key bindings for another.
In summary, certain tools work for certain people. As long as people are using quality tools, why does it matter which one is used?