I was mainly Java dev for 10+ years or so; I was a whiz at Eclipse. Then, one day, I forced myself to learn a Clojure. It just so happened the ecosystem mainly leveraged Emacs. And so, I forced myself to learn Emacs. It took a while - the key bindings, reading up on how to do various things, discovering great packages, learning enough Emacs Lisp to be dangerous.

It was very rewarding, and I use Emacs everyday now. Today, I can't imagine not using it.