"Google's driverless cars mean the company will know your driving habits and where you like to go." I think they already know that, if you have an Android phone.
I think you're right. My brother was telling me the other day that his new phone has learned where "home" and "work" are, and it automatically changes settings based on where he's at. I don't think he inputted that information; I think the phone just extrapolated based on GPS data. Kinda creepy to me...
Yes, and if you have location history turned on you can go to your Google account in a web browser and watch yourself walk and drive around town. If you turn location history off you don't see it any more, but I'm not convinced they're not collecting it.
Additionally, some (probably most) cell phone service providers constantly interpolate your position (necessary for maintaining signal) and store the data for some amount of time. It's scary. And that was almost five years ago...