I've been using Vim for over 10 years. The first few years I used it badly. Later I took time to really learn it. Now I can use it fairly decently, but I still learn new things every now and then.
It feels like a really good investment. It's been around forever, it's gonna be around forever, it's installed on almost all computers, and you're going to be forced to use it at some point or another.
I really enjoy being able to go to any computer and starting up a familiar editor, without installing or configuring stuff. I also use a very vanilla Vim. If a coworker's laptop or some server has a different Vim config than mine, I can usually do vim -u NONE
to get back to a familiar place.