sardello Unfortunately, Google collects a lot more than that, even if I have made all Google settings against sending.
It really is up to you.
You are writing that you are a heavy user of Google's product, but you want to eliminate excessive invasion of privacy. You, yourself would have to think about it and ask yourself, where is the line for having and using services that you are comfortable with even though you are aware that you are paying with your privacy.
I would start with finding alternatives, that would work for you. There are many pages devoted to alternatives to Google apps. The "issue" can be that sometimes Google really has a good product and user doesn't want to loose some functionality. And you should find right balance that works for you.
There might be a big upside to it. Once you start searching for alternatives, you can realize that there are better apps out there, and that you are using services that are quite obsolete and that there are easier ways to achieve something. And maybe not:-)