Rider is definitely usable on Linux... it works on MacOS and Windows as well, and imo, better than VS for Mac. I've pretty much stuck to VS Code for pretty much everything, though the conspiracy theorist in me thinks MS intentionally gimps functionality in the VS Code extension support for .Net (they've shown this a couple times, live reload for example).

I work in .Net for a lot of backend code, mostly in WSL/Linux on VS Code. And it's not been horrible, though I'm much more efficient with Node or Deno at this point. Since .Net Core (and now .Net 5+) the space has changed a lot.