At the risk of adding fuel to the fire, I'd just like to say that I can't go back to IE because I've become dependant on a) tabs b) must-have extensions.
A browser is no longer complete without extensions such as adblock, spell check, and *session saver*. And definitely not without tabs.
I realize that you can secure IE if you take the right precautions, but it doesn't make sense to me why people insist on using use IE if you can get a browser that is more secure, has better features, and is more useable.