Frankly that is indeed a valid use of the traveler. Especially on the anchor or at the dock. It also helps in moving the boom so I can get the sail cover on.So far, I have only been using the traveler to move the boom out of the way when the main sail is down and I want to have a better view and more space to eat lunch in a calm
My traveler serves as a back rest (read - annoyance under sail) when it is centered.
Mostly I use it not for performance, but to spill air and manage heel - something that is a nice side affect and beneficial to cruisers who don't too much care about the extra .1kt but do indeed care about not waking up the off watch.