Hacking without distractions
I am getting really fond of running MacVim in fullscreen mode. It removes all the distractions and uses all the available space.
To toggle the fullscreen mode simply press ⌘⇧F.
If you want to start in fullscreen mode add this to your vimrc:
if has("gui_running") set fuoptions=maxvert,maxhorz au GUIEnter * set fullscreen endif
Hat tip off to Armin.