People in this thread arguing that "only if you have something to hide should you be worried" are so horribly naive (or ignorant) it's embarassing.
LOL give me a break. If data is stored somewhere, then
somebody can definitely access it. So there is too much data for any one person to read through? Irrelevant.
Here's one example, you had a falling out with some bloke at a nightclub, maybe over a girl, who knows. This bloke just happens to know an "admin", in charge of maintaining a database such as the one being discussed. Now suppose at the touch of a button he finds out exactly where you live, whether you live alone, your internet surf habits, even all your personal details such as what you like to fap to, whether you pick your nose, etc. The next time he meets you he brings all that private stuff up and embarasses you in front of all your friends by reading a list of all the things you didn't want them to know. And it was possible, simply because the data existed, and the guy looked you up.
"But if that guy did that, he'd be fired!" I hear some of you say. Irrelevant. You don't even know if he would get caught. Deterrents are not 100% prevention, in any scenario.
"But there would always be physical measures in place to prevent this sort of thing from happening!" I hear some of you say. Sure thing, because the authorities and companies in the UK alone have been looking after our personal data
so well over the last few years.

This sort of thing could never EVER happen, right? lol.
As for the whole "Google - Evil? vs Pure?" thing, Google is just a company. They might have an unorthodox organisation model, but that is irrelevant. Just because Google has built up a reputation of being "not evil" etc, doesn't mean you should assume their reputation holds actual truth.
Incidentally I'm not saying Google is evil either. I just urge people to acknowledge that
we do not know enough, and we shouldn't
assume it to be one way or the other from simple hear say.