Maybe I'm missing something, but I don't see how not playing video games or watching TV is a creative constraint. I can see it helping with time management, but I don't see how it directly helps you improvise. Also, TV is in a golden age right now. If I had to pick, I'd take the quality episodic TV shows coming out of HBO, Showtime and the like over movies anyday.
> I don't see how [not playing video games or watching TV] directly helps you improvise
Let's just say it makes me less immersed in today's era when it comes to matters of visual taste/preference, which in turn lets me make creative choices that some people may find surprising (or at least that's what my self-serving bias tells me).
I do understand the importance of keeping up with trends though, but I restrict my trend-seeking to people who I personally perceive as trendy (and which tend not to be on TV).
I can see that to a degree, though I think some video games (especially indie ones) could be inspiring as well. But I appreciate that we all have our chosen muses.