Let’s just use Emacs presents a compelling case for Emacs as a writer’s tool — not a geek’s tool — a writer’s tool.
In the process he takes us through his history and frustration with Emacs to the modern day where tools like Org-Mode, elements of a modern UI, and darkroom-mode, plus (in my experience and in his) a more active development community, have made Emacs into a great writing environment.