Much like how some people enjoy tinkering with motorcycles, electronics, or craft projects, I enjoy tinkering with software. If my computing environment stays the same for too long, I start getting restless. I crave constant change.
Emacs is a tinkerer’s dream, an infinite sandbox that can be molded into something entirely different each day. I can dive into the manual and discover new features, try different combinations of packages to see what’s most comfortable for me, glue together packages to make them do things they was never intended to do, write snippets of ELisp that help me get my work done faster, and so much more.
In this way Emacs is not only a tool that lets me do my job, but also a creative outlet that provides endless hours of entertainment and joy. I consider it one of the best pieces of software ever written.
Of course, there are other reasons for using Emacs — longevity, efficiency, ubiquity — but these features can be found in many other tools both free and commercial. Only Emacs is good at being Emacs.