I switched from Emacs to both LightTable and Atom full-time. While I'm much more efficient in Emacs, integration are the killer features in the other two, in a way that I didn't have my .emacs setup.

With LightTable, I do mostly WebGL and I often have a browser tab up with my live WebGL stuff all the time. This is super efficient and extremely nice.

With Atom, I do mostly web development. Quickly jumping between files (faster than I did in Emacs) and knowing which files have been changed (they're highlighted in the tree-view) is very helpful for all work-related things.