I'm a pretty hardcore Emacs user, and I'll just come right out and say it: I hate Emacs. However, the only thing I hate more than Emacs is anything else.

I tried to move to Atom, because I've heard good things, I read you could extend it in JS and that sounded good to me. The difference between customizing Emacs and customizing Atom could not be more night and day in my experience. Emacs is like a living thing, as crazy as that sounds. I feel the urge to make a slight customization to a key (which happens often) I just ask Emacs what function the key is executing and either wrap it in a custom function, or advise the function. I usually write and eval these customizations in the scratch buffer.

Meanwhile, Atom makes me restart to get any changes detected. There wasn't any live documentation system that I could find (which is something I can't fathom not having now).

Emacs, in terms of customization, is simply light years ahead of absolutely everything else. It's absurd to me that we're still stuck with it because seemingly nobody who wants to make a text editor has learned the lessons it has.