I would suggest that Vim is about more than speed, it is about flow. Think about the difference between ctrl-c and navigating to the menu to copy with your mouse. One just feels more fluid and requires less thinking. Games use extensive keybindings for the same reason.

Vim in particular is a philosophy of keybindings. It has a syntax and a logic to it. For example `daw` will delete a word. To delete a sentence you would `das`. Guess what you would use to delete a paragraph? Once you "grock" vim logic you can perform more complex actions without much cognitive overhead and with your fingers on the home row. Writing in Vim gives me a feeling of mastery and fluidity with the machine I have not felt since my competitive gaming days.