Only reason to use IE is if you're using Windows Phone or Windows RT - Microsoft platforms that do not allow third party browsers.
If you're using Windows Phone, whatever, I don't get it but it's your phone bill.
If you're using Windows RT, you're using computers wrong.
I'm not using RT, but why the hate? IE10 is quicker than Chrome on my PC right now, so I'm using it. And I enjoy Windows Phone. In fact, I enjoyed it so much that I advertised for it.
I personally find windows phone (and ios) highly underdeveloped/unfinished-feeling products that simply don't have the software to be as versatile and powerful as I need the computer in my pocket to be.
But that's just personal opinion.
Windows RT, on the other hand, is a bad joke from Microsoft. My own personal feelings on Metro aside, making a clone of your primary OS that is 100% incompatible with all the software people are going to expect to run on it is now considered a good idea? Let's put it this way: apple releases the Neo-iPad. there is absolutely no way to tell it from the preexisting ipad except there is, PURPOSFULLY, zero software for it, and zero backwards compatibility.
That'd go over like a ton of bricks.
I understand MS was feeling constrained by being tied to x86 chips, but at this point it would have been smarter just to push Windows CE to the consumer market. In fact, why didn't they? I have yet to see enough of a difference between the two of them to justify them being two different products...