from the security perspective, IE is a piece of junk.

from the business perspective, IE still dominates becase so many applications are based on IE standards not W3, and none of the provider would ignore this dominated number and force their user to use the others.

from the human's perspective, most of people would ignore as they are used to it and would refuse to change it. and more, most of them have no idea what the real concers are for using the IE.

To me, I am still IE fan and like to stick with it at this time because the firefox is quit disappointed me about lacking some flexibilities.