Seriously? That has to be Tab. Between indenting code, cycling windows, moving between form input elements, switching tabs in applications with tabbed interfaces, and innumerable other uses, it gets a lot of work for vital things.
On a less serious note, as a devout vi user, I was tempted to vote Esc.
And on a boring note, the space bar wins hands down for most used key. Itsmerenecessitymakesitaformidablecontenderinthispoll.
Makeshifts last the longest.
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