In particular, Org leads to very nice and simple text-mode workflows and mini applications. Besides, apparently Amazon used a custom Emacs application (not Org-based) in the early days to do customer service [1].
I actually very much prefer it to Unix ncurses applications, which tend to be little information silos. In contrast, Emacs makes it really easy to connect everything together thanks to great Elisp APIs. It feels like a really cohesive environment. Unix shines for non-interactive workflows.
I like doing my computing in 3 (actually 4 platforms): Emacs, a browser (Firefox), a terminal (XTerm) and F-Droid. That, plus a nice manual tiling WM (StumpWM) and functional plumbing (NixOS) is a great simple setup.
For example, a good keyboard, no compositor and XTerm reduces latency a lot vs more complex desktop environments. It's really noticeable.