Haha, didn't know that one.
What I always do is hit cmd+z then shift+cmd+z.
Cmd+z (undo) jumps back to were you last made and edit and, well, undoes it. But since you probably don't want to undo, shift+cmd+z does a redo. So then you're back to where you need to be.
And I assume that even works more quickly than your secret agent method, since it's just two keystrokes.
