The killer feature of Atom to me is the ease with which it can be extended (via packages) and the openness to community contribution on core features. That's not a knock against any other editor (some of which share similar characteristics in this regard) – it's just what draws me to Atom. It's super easy to hack on and contribute to.
Welcome to what I've felt with Emacs since I first used it. Might be time to work on some tutorials and examples to make Emacs easier to hack on and contribute to...
Have any experienced Emacs users found that Atom makes them more productive in any dimension? I want to like it but I can't see the light at the end of the tunnel.