I switched from google search to duckduckgo. I still hit an occasional search on google but that's a percentile of the searches they got from me before that decision.
I host my own mail server. Yes I still have that gmail account for stuff that are not important enough to migrate and look it up from time to time but the majority of my personal email traffic now goes through my own server. They still get some of my mail if the recipient is a gmail account but guess what? It's not all of my mail.
I don't host files on Dropbox or the Google drive. I have my own owncloud server on the same box as the mail server.
I host my own jabber server for real time chat - mostly with my wife as a lot of people no longer use anything except google/facebook chats. I talk on IRC with tech friends/work, jabber for personal stuff and once in a blue moon I open up that g+ chat to check if someone wanted something from me.
I do my backups on tarsnap, feels great.
I run Linux for my work machine and OpenBSD for my private machine.
I do have an Android phone but I essentially stopped carrying it with me everywhere. I hate being a slave of the phone, no longer have a mobile data plan and I take the phone with me only when I really need to be reached.
Does Google know a lot about me? Yes. Are they still learning more from people I communicate with? Yes. The point is, they are getting less information. I already noticed a large quality drop in the accuracy of google searches/youtube recommendations for my account.
Side effect from all of this is that people in my close circle of friends tend to pick up some of the habits (duckduckgo & other small bits). You don't take down a giant with one stroke, you cut it up piece by piece.