I agree. It drives me nuts when people leave them in, including my father who insists on using a lock. Guess who gets to cut it off when it freezes in or he needs to swap bars for a different drop or ball size.... I think I have cut three off now. Not a easy job without damaging the hitch or truck. Stay away from locks.
This is one reason I love my Titan. There is a built in locking box for the hitches. I keep 3 in there, a extra pin, 6' 3/8" chain, 30' tow stap, and 4 1" ratchet straps. Its safe, secure, and water tight.
Chris