If you are good at rev matching on downshifts, the clutch wear will honestly be negligible compared to other driving duties. As to engine wear, as long as you're not revving the piss out of the motor, a zero-load mid-rpm condition is probably easier on the engine parts than idling since the oil pump is producing more flow and the only load on the bearings is the compression stroke of the pistons, but no power stroke.
All that said, I agree with Nate it's not really necessary for daily driving. Though if you have reason to believe a light is going to be changing soon, you're better off coasting to a stop in 2nd and continuing to roll as the light turns green, than charging the light, coming to a complete stop, and starting again.