It's good to have if you want to go peer2peer eg. not having a server in between. Btw, Google Docs don't use a OT, or only a simple one, it does depend on the server and that you are online.

A writing style that I try to use is that I just type ... don't look up words, just write YYY where I can't find the right word to use, then I read the text and fix all spelling errors, sentences, remove unnecessary parts etc. That way you can be in flow. But instead of you doing the fixing later, someone else can do it for you - while you are writing!