I disabled it immediately. It's distracting, and I know how to search. The average person doesn't understand how Boolean Search works, so they have a very hard time finding anything. I know exactly how to find what I need, so I don't need this "helping hand" from google.
I use chrome as well, but my search bar defaults to wikipedia, not google.
When I use Google's search, I either just type what I'm looking for and hit enter in Chrome (love that feature) or I use the search bar that's available in browsers. I rarely actually go to Google's site and then search.