I was forced to learn the vim basics. Mainly because I really started with dd-wrt, which I used on my Linksys WRT54GL.
The image was too small to package anything fancy in it, like nano or something, but vi (or vim, I forget) was included. So when I needed to check something over ssh at the command prompt, vim was my only choice.
My skills in vim have not expanded beyond the basics. Getting into edit mode, exciting edit mode, saving, quitting.... Mostly.
I don't spend a lot of time editing files in the CLI, so I haven't needed any more than I already know. Now, when faced with a Linux cli, and needing to check/edit the contents of a file, my go to, is vim. It's pretty much on every system, and it works perfectly fine for what I need to do 99.99% of the time. I like vim, it's been there for me through thick and thin, and helped me out of some serious jams. I won't hate on nano (or any other cli file editor), they all have their pros and cons.
Use what you like.
<3