I've used vim a great deal in the past and it really is exceptional for editing a given file. The thing that really tipped me to ST2, though, was its management of multiple files in a project. The sidebar and Goto Anything are indispensable. I know vim has command-t, but I just haven't been able to browse a family of related folders as easily. How do others do it?
Also, I just can't get used to the line-by-line scrolling of vim and emacs vs. the pixel scrolling of Sublime, or TextMate, or even TextEdit.