I am not using nixvim, after I had some trouble with too many indirections when I started using it.

And at the same time, I often experience support requests by users in the unofficial NixOS Discord, because of the nixvim team not keeping up with changes in nixpkgs quick enough.

Also the more experienced neovim users say that therre are technical issues with the implementation of nixvim.

The sum of these 3 experiences made me write my own neovim config without any frameworks, basically providing my config via a plugin which is put into the neovim load path.

If you want to, you can take a look at it, as it is right now (and even directly run it from the flake via nix run github:nobbz/nobbz/vim).

https://github.com/NobbZ/nobbz-vim

For some reasons though the elixir setup has problems with my dayjob, and therefore I am still using VScode for work.