OTOH try Google Docs for anything larger than an article. It will blow your browser.

How large article you are talking about? I used Google Slides to make reasonably heavy power points, and it performed well.

It will rot your mind. I'll take LaTeX + git, thank you.

Oh yes, vim + latex + git is better than any google docs when you know how to use it. When you need to collaborate with non-technical people, it's a different story - I've been in that situation and even successfully taught basic git to few people, it's not worth it in the long run.

Try Etherpad.