This is exactly why I switched from emacs to vim, after a couple of decades of emacs use. I decided I'd put up with slow editing for a few days, as I forced myself to use vim. (It was that or not type for a week or so.) After a few days of frustration, vim started to grow on me. Swearing became less frequent.
A month later, I was perhaps 75% as fast in vim as in emacs, and my hand pain had completely vanished.
And a few months after that, I noticed that I was really quite fast in vim -- certainly faster than I was in emacs -- and that the constant puzzle-solving (finding the action that required the fewest keystrokes) was intriguing.
Using emacs seems to me to be an exercise in remembering, whereas using vim is more an exercise in thinking. Part of the appeal is that this thinking does not interfere with the thinking involved in writing. It's a bit like driving a standard car: the extra cognitive demand (do I need to shift now? are the revs right yet? am I at the biting point?) seems to be handled by a different processor, and having that processor working makes the experience more enjoyable.