Atom is a graphical editor, unlike either Vim or Emacs. It's much easier for web developers specifically to work on, since it's built with web technologies, rather than vimscript. If I want to change the background color of the file browser pane, I can pop open an inspector, identify the element, and change my custom editor CSS, all within about 2 minutes. Its plugin distribution system also integrates directly into the editor - meaning I can browse for and install plugins from within the Atom itself.
