Since a few days I’ve been using vim in full screen mode, that is, the only thing on my screen is my editor. No panel, no task bar, no systray. It may be subjective, but I have the impression that without all the distractions, bells and whistles on my desktop, it is easier for me to concentrate on the task at hand. Compare

to

With metacity and GNOME, you can set for example Shift-Alt-Enter to toggle full screen mode. This is similar to Alt-Enter for toggling maximized mode, so it’s easy to remember: