I know that org-mode is often cited as a reason to use Emacs, but I have to admit that despite being a daily Emacs user of almost 25 years, I hardly ever need it. When I do use it, I'm very happy with it but then again, I use but the most basic functionality (bulleted lists with foldable headlines and sane paragraph filling).
Nevertheless, it's great to see an open-source project strive, especially one that is so versatile and appreciated by many.