I also use the Sheldon method. If its real sketchy i will use another lock to lock the front wheel to the DT of the frame. This is just riding around town. Not on a tour. If someone really wants your bike they will take it. Like the OP said. its about deterrence. Think about if you wanted to steal a bike. you see 2 styles of lock on one bike or another bike with only one flimsy lock, which one will you pick?

Its like running from a bear with a friend. You don't have to be the fastest man in the world, just faster than your friend...

Thanks for the info.