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"I refuse to do anything more with Google than search and email. I am just not comfortable with one company knowing that much about me."

In that case, you'd better install some browser extensions to block Google Analytics. They could correlate the IP address from your email and search with your visits to every website using Google Analytics for metrics and extrapolate more about your from there.

Ghostery is a good choice: http://www.ghostery.com/

If you use them for email then they already know much more about you than you think. What's the difference between Google and Master Card knowing your purchases? Unless you cash your paychecks every week and only spend cash then a company still knows everything you purchase.

It could be argued that this represents 80% of your life already. How often do you discuss new things you bought with friends? Quite often probably, except for some things which are very private. But even some of them can be inferred from your searches (e.g. for medications). The question is, how much (technological) effort is Google willing to throw at this problem to find out this much about you. (In the same vein, I am often wondering whether Google has some special APIs for governments which allow for some deep data mining of their data for special fees. But perhaps that's just me being overly paranoid.)