I did some FOSS hacking as a teenager a quarter-century ago, so learned Emacs, but then ultimately chose a career unrelated to software development. I still use Emacs for anything and everything text-related: email (Gnus), RSS feeds (elfeed), org-mode where I write up both personal TODOs and serious academic research. The keyboard-driven interface is powerful and now muscle-memory. The in-built Lisp environment makes everything nicely extensible, but Emacs as an IDE, as something people have used to create general software projects, is something I rarely think about.