Semper Fidelis Tyrannosaurus!
I never click my name next to logout. You can do the same thing by clicking "My Geek" to the right.
To be honest I never even noticed the logout button above the search box. I've never had a problem clicking it by accident, I suppose because I watch the mouse pointer and click when it's a caret, rather than an arrow or hand.
I find it to be more of an issue with a touch screen than a conventional mouse.