Professor Keith Johnson has said that the signal travels twice as far in a balanced cable and they present there own set of problems.That's pretty funny!
If he really said this it suggests he doesn't know what he's talking about!!!
Look at a single ended cable- the signal travels in the center conductor, and the shield is the return path. In a balanced cable, the signal travels in a twisted pair, and the shield is ignored (not used for a return path). The distances are identical.