I'm a relatively big fan of TeX but in my whole life only once have I met a co-worker who also used it. Yes, in theory is great for collaborating, but it practice it's not because nobody would know what to do with a TeX file if you sent it to them.
For me it is less about it being better at collaboration, and more that the popular alternatives are so bloody awful.
It is frustrating, because the popular choices all make better demos. But recovery is often so painful that you start living in fear of formatting mistakes.
