You have nothing to hide until you need to hide something you believe. It's obvious in other countries (Turkey, Iran, so on) that the government is seeking dissidents and locking down Internet to silence the people (so that they can get away with shit). But the USA is also trying this - by the way of various lawsets (SOPA, TPA, PIPA). And when that passes, you'll have plenty to hide - that you watch shows/listen to music not licensed in the US (or without your personal license, like downloading it from a place not authorized by whoever carries the copyright... which could also shut down Netflix). So even if you have nothing to hide /now/, using VPNs or TOR is a way to protest against these things.
Purely out of protest. I'm fortunate enough to have access to all the content I want to watch (that I know about - I'm not saying I know about all the shows and movies out there). But these law projects are, to me, simply disgusting - as, from what I understand, all of the planned laws so far give the tools to ISPs to turn the Internet into a glorified, interactive cable TV ON TOP of giving the intelligence agencies the tools and legal background to watch where you're surfing (and if you're circumventing the blocks put in place).