I generally agree that it doesn't matter a lot, but I've found one case where having well-arranged cables is useful: if you want to move the equipment a short distance temporarily (for example, moving a tower case out from between/inside furniture, or turning a monitor around to show it to someone else). Having the cables to the device arranged so they all have sufficient slack, and are not tangled with each other, means you can do this without having to unplug anything (and possibly shut down/lose use of the equipment).