You start in a file where you aren't even editing yet. From there, to start almost every type of navigation, highlight, or edit action will often be a few character combinations. Go to the end of a file and adding text to the end of the line would be "GA", for example. Most actions don't require adjustment of your hand placement (and its even better if you remap capslock to escape) or use of a mouse. Whatever action you take can be repeated with a simple period (big time saver if you need to repeat an action mutliple times).
More powerful commands like find and replace are available with the command mode. It works perfectly well over a remote session, also
Once you learn the keys that correspond to your desired actions, everything else feels wasteful (Especially as I'm writing this on my phone). I turn on vim keys for anything that has it. It takes a long time to build up your vim vocab (I recommend you learn the simple stuff and incrementally look up better ways to approach things as you go). A great way to get started is vimtutor, which is built in when you install vim; just run vimtutor from shell and start reading. There's a lot more depth to what is possible, buffers, plugins, etc. but that's what stands out to me.
I like how baked into this question is how a practical single-payer solution is not practical due to purely political reasons. (Where your house cleaner's taxes pay into a large risk pool and their healthcare costs are based on their income)