Right now I am posting with IE, because I'm going to play some Civilization 3 for a bit (it works with winex, it's unplayable though) and I couldn't care less about customizing my windows installation because that's the only thing I use it for... games (and with RTCW released for linux and the upcoming release of the Neverwinter Nights linux client and some great upcoming GameCube titles that's going to be less and less
).
However most of the time I use Opera or Konqueror for linux. I'm especially beginning to like Opera, nice fast browser, clean interface, and some nifty features, only drawback are the banner ads (but I can live with those).
If IE were to be a stand alone program it would actually be a very decent browser (though it lacks some features like popup blocking and is a little insecure) however seeing it is so closely (and unnecessary) tied to the windows operating system it loses a lot of points in my book. Just take the fact that that SSL exploit was fixed for konqueror in 90 minutes, while MS is still busy trying to find a solution (and even issued a bulleting lulling their customers into a false sense of security).
That I don't like windows (I'm avoiding the word 'hate' here) does not mean that I never use it, sometimes it is something I just cannot avoid (though I hope this will change in the future, we'll just wait and see if there are more game developers like Bioware and id)