I switched from emacs to vim because I was tired of typing `git commit` and waiting 3-5 seconds for emacs to finish launching and setting up. Since switching to vim I've installed more vim plugins than I ever had in emacs, and yet I can still launch gvim (not just vim, but the GUI version!) in a fraction of a second.
I just always have an emacs running, and use emacsclient to open files in it. Anyway, if you're typing "git commit" you may not be using the capabilities of your editor to the fullest.
I've never found an in-editor git interface that I like better than the command-line (although I am aware that Fugitive is considered to be extremely good). Besides, I do a lot of work outside of Vim. In fact, most of my work is outside of Vim, because most of my work is done inside of Xcode.
