I just switched from ViM to emacs (mostly for SLIME) after about 6 years of ViM usage, it wasn't a big deal at all, both are great.
Though vim is no longer my main editor I still use it every day. Right tool for the job and all that.
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Clarification, since I'm getting downvoted for that: Go look at the guy's profile, and his blog. He's an experienced dev, using vim for "6 years", and he's been on HN for three, has racked up a bunch of karma, blah, blah, blah. I'm pretty sure he got past the "use vim as notepad" stage. Assuming that he hasn't is assuming that he's a moron, and contributes nothing to the discussion.
How about you deal with the meat of what he's said? Something like "vim can do this thing which emacs can't" (unlikely) or "emacs does this annoying thing which vim doesn't" would be more productive than "Hey, I'm going to assume that you know nothing about vim, despite you using it for six years"
Actually, that's more of a rant than a clarification, but I'll let it stand.