I've been meaning to try vis for a few years now, because it supports Rob Pike's structured regular expressions, but haven't gotten around to it yet due to inertia. So I'm still using vim too.

I've also thought about neovim but am unsure whether the vimoutliner plugin will work with it. Does anyone know? It's old and probably obsolete but it's been a part of my workflow for almost as many years as I've been using vim.