vim is awesome for editing files locally but copying your
.vimrc to every system you want to edit files on and keeping it in sync can be a real PITA. You could use something like Cowboy's dotfiles, but if you're working on systems you don't control you probably don't want to be putting your vim config there anyway.
A great alternative is opening the files within your own local install of vim (or mvim if you have it installed on OSX) over SSH.
vim scp://[email protected]//etc/aliases
Here is a gif of it in action