I've "only" been using it since 1998, but I always skim threads like this -- even lots of short articles -- because there's nearly always something new to discover! Sometimes it's hard not to gush, but it's just such an amazing and organic piece of software.
Org-mode is what finally converted me to being an emacs user.
I'd been searching for a lightweight, console/cli-mode outliner/task-manager when it occurred to me "surely emacs has something for this". It did, of course.
For several weeks I used emacs only for org-mode. Slowly but surely emacs started to take over my more and more of my editing tasks. Now I find myself not even bothering to launch X, but simply emacs from the Linux console (run level 3?). It's amazing how responsive a computer is when you're not using any gui at all.
I've since discovered that org-mode is pretty common gateway into emacs.