I have all 4 major PC browsers (IE, FFox, Safari, Opera) on my system, for compatibility testing, but for my daily browsing I still prefer to use IE.
I'm not a MS zealot, or anti any of the others, but I find that IE works more the way I expect a Windows app to work, and requires the least amount of adapting by me. I guess the same would be true of a Mac user and Safari ??
However, as a web-dev, I have to say that IE is my LEAST favourite... because it requires the MOST amount of adapting by me to make it behave the way I expect HTML/CSS to.