Tried and true in the telecom industry and in naval and aerospace applications, we don't see any reason why you can't try cable lacing to keep your media center or workspace wires under wraps!
The cool thing about cable lacing that gives it an advantage over plastic or velcro ties is that it travels the length of the wire without creating any obstructions. After binding a few wires together with cable lacing, it will be like you've only got one. It'll be easier to handle and bundle and harder for them to come undone.
And, heck, it's easy! All you need is a thin cord—a waxed cotton twine would be perfect—and your mitts. The running lockstitch of the marline hitch, a common lacing technique, is easy and probably exactly what you need to finally tackle those cords behind the TV stand.