Labels is the better idea but someone already mentioned that so I thought I'd mention this way.
Labels has another advantage over my method. If the developers ever add a new feature that accesses the hidden/not hidden tag on TV shows, it could make things more difficult for you. I was also using this method to control what movies showed up in my DVR section. But when the developers added Theater Mode (which doesn't work on movies that are hidden) I had to switch to a different system in order to use it! That's what happens when you use features in non-standard ways!