It depends on the subcommunity. I have seen LaTeX essentially everywhere in CS, but I recall some exceptions. I'm not sure where, but I think it was applied stuff, probably close to some application domain (e.g., bioinformatics).
I've made some good experiences with Authorea, a paid online collaborative scientific writing tool, I think that one runs on top of Pandoc+git too, but it doesn't have full Word import support yet AFAIK
Edit: 0 mentions for Authorea in this entire discussion, I guess these guys need to do a bit more advertising :)