Aren't casual vim users really vi users? I use emacs primarily but years ago created an extremely minimal (~20 lines) .vimrc to be installed by default on every server I work on. Some color, maybe indentation, I don't even know because I usually just use Emacs/TRAMP these days, but I'm nearly 100% sure that every config there works in vi. I would consider myself a casual vim/vi user in that I don't know the differences.