I don't use Nano but I've considered it. It seems like writing on a tty would be the closest digital equivalent to using a typewriter, though, and I've found that a single-function device for writing reduces distractions significantly.

Not really the same as Nano/vim, but I recently switched to using Obsidian/IAwriter and writing everything in plaintext markdown. I haven't used a "real" word processor more than 10 times in the last few years I'd say, and then only for professional stuff. The reduced overhead is something I don't see myself ever going back from. Similarly, I think Nano-only would be a viable approach.