Emacs just has shortcuts for everything and as such a given shortcut can take a few key presses. Vim has modes which reduce keys for given tasks because it's usually just one key. But then you have to switch between modes a lot. It's all very well speculating which of the two is more efficient, or giving our personal experience, but I am wondering if anyone has made a proper statistical study, given some text/code editing tasks to perform, how many key presses it takes to perform the task in Emacs and Vim. If anyone has spare time to kill, that might be a cool project to do. You could include other editors.
(May I encourage you to downvote the inevitable hilarious jokes that will follow mentioning of an editor.)