Some 'important' internal developer had the opinion he was clever and helping everyone out making something so cool as super wide tabs. I actually thought, 'wow this is cool' when i first saw them wondering why no one ever thought of such a great idea until I ACTUALLY TRIED USING THEM!
Please Mr. Clever Dev suck up your pride and default back to the way it should be working your cleverness into a checkbox somewhere in the preferences. While you are at it why not add a 'Close Tab' option to the right click menu from anywhere within the webpage itself.
By the way I love that a double touch of the magic mouse zooms into the page content the mouse is hovering over just like on the iphone. Pat yourself on the back for that one. It is a great feature for those of us with bad eyesight.