AFAIK it's fairly popular, though I'm sure many are happy enough writing markdown files. If you don't use emacs, you're probably not using org– though I believe Github and some others support it in their editors. Literate programming with org[1] seems to be a thing now which, if you haven't seen it yet, might be fun to try out. Searching Github may yield some files like that, but you'll have to wade through all the READMEs written with org.[2]
I happened to be taking a course that required lots of LaTeX for assignments so it was really nice to use regular text and LaTeX without all the scaffolding code.
Org-mode has an exporter for latex and making new skeletons for its export is fairly straight forward. I am liking it a lot and have changed to that over writing tex by hand nowadays.
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[ 3.3 ms ] story [ 16.7 ms ] thread[1] http://justinlilly.com/emacs/literate_programming.html
[2] https://github.com/search?q=extension%3Aorg&type=Code&ref=ad...
I happened to be taking a course that required lots of LaTeX for assignments so it was really nice to use regular text and LaTeX without all the scaffolding code.
I even wired up Babel support for a new language.