Vim is my favorite editor because using Vim I can edit circles around anyone using Atom, Visual Studio, Sublime Text or any other non-keyboard-based editor. If “computers are a bicycle for the mind”, then using Vim is like shifting that bicycle into high gear. I like to shift that gear even higher using a few certain plugins:
vim-rspec lets me run my tests with a keystroke.
vim-rails takes advantage of the common structure of all Rails applications to let me navigate any Rails application super quickly.
ctrlp.vim allows me to quickly search for and open files (not earth-shattering or unique but of course very useful).