On the editing side, though I use and really prefer text editors and markdown, I had never thought to place every sentence on its own line (sentence = line). That simple idea in itself is kind of revolutionary and could do wonders for writing structure. Imagine if school children could be taught to write like that. It makes paragraph structure so much more transparent.
Have used pandoc, except that when you are working on a document with others who only know MS Word, early on in the process, it's already gone into Word, and you aren't going to keep converting it back.
I still need to read more carefully about using git. Since I'm not a programmer, I have only ever used it in installing or updating software (like hubzilla).