I don't think the amount of people using any of the various (afaik all rather alpha-stage) GUI frontends is very high at all, at this point. People use nvim in

I don't think the amount of people using any of the various (afaik all rather alpha-stage) GUI frontends is very high at all, at this point. People use nvim in their terminal, and that will likely be the case for a long time. In any case, there are many multiple cursor plugs for vim, now also supporting operator pending. And :substitute includes built-in real-time preview.