I did a `ls -s .vimrc .nvimrc` along with very few changes (like replacing Command-T with Command-P). Everything ran just fine. I still don't use nvim daily, mainly due to my old habits. Perhaps I should alias nvim as vim.

That changed recently to follow XDG specifications. Simuink locations should be changed accordingly. See https://github.com/neovim/neovim/wiki/Following-HEAD

Everything should work out of the box. Just symlink your configs and go.

In my experience, vim configuration and plugins tend to just work.