I normally write C++, but I've also written in Rust, Python, Ruby and bunch of other languages. I've never had trouble with a programming language until Haskell, and had to accept that I'm just probably just not smart enough to do it.

However, I wrote my first thing a port of a small C# tool of a couple hundred lines, to F# in about an hour. It's been about a week now, and things are considerably smoothing out.

To be considered niche, the F# tooling has been great. Also, having the .NET libraries available adds a lot of built-in capability.