I have to admit that I used to do that in Firefox, back before I switched to Chrome.

Firefox address bar used to make it really convenient. It did a kind of "feeling lucky" search, taking me directly to the first result if it was the "right" search result, or to google's search otherwise. I don't know how google determined if it should display a results page or not but it used to work very well. I stopped caring about bookmarks and and memorizing URLs and just used keywords to get where I wanted.

Of course it's silly for really popular pages like facebook, but it worked fairly well for pages I used to visit ocasionally.