Google makes it easier to fully turn off Buzz and delete your profile
Previously, this just hid Buzz in Gmail. Now, it gives you the option to either hide it or shut it off altogether (even on the mobile version of Google.com). If you ever decide you want to show it or re-enable it, you can just click on "turn Buzz on" in the same location at the bottom of Gmail. When you reactivate Buzz, you'll have to remake your profile and start following people again, although your followers will remain intact.