Yeah, if they were just upfront about privacy and changes and the implications, I'd be a happier user. But now that Zuckerberg is doing something pretty damn cool (the medical research project), actually, it sort of makes up for past privacy sins. :-)
When I deleted my Facebook, I lost friends. But if my friendship with someone relies on my having a Facebook then, well, fuck them. I text people or call. I also don't need to know what everyone is up to, either. They can tell me when we talk or hang out.
Coincidentally, the friends I lost where the type of people who are on their phones the entire time we hung out, so I don't consider it much of a loss.
I consider Facebook -- for me -- wasted time, though, and I didn't enjoy it. If you do like it and you're comfortable with the platform (because, tbh, I'm one of those tin-hat security nuts, too, and Facebook skeeves me out on principle), then keep it. Or, if you're curious, disable it for a week and see what happens. There's no one-size-fits-all solution for everyone.