Having all that information (school, doctor, lawyer, pest control company, health insurer, employer, credit card company, ...) about one person or a family, together in one place, is a social-engineering / identity-theft cornucopia. Imagine if Path had a data breach resulting in this contacts database floating around the internet.

Now most people's response to that kind of threat is to think "I'm just nobody important, no one would ever go to the trouble of using this information to impersonate me or otherwise make my life difficult." Probably you are underestimating one or more of: (a) your importance, meaning how much money someone stands to gain by impersonating you, (b) the gullibility/apathy of customer service reps at the companies you interact with, or possibly (c) the amount of free time and/or perversity of someone who will fuck with you just for the lulz.