IE8 is okay now, but it's still so very annoying. I particularly hate the initial screens you get after installing it. You're forced to walk through about 8 different steps just to get started.
It's even worse on servers. You get the same screens, then at the end, you get about 8-10 more popups warning you that IE Enhanced Security has blocked content to protect the server. What content? Files from microsoft.com and bing.com.
I've gotten mixed reports, though, about whether this vulnerability was just in IE6 or all versions of IE. Maybe that was all versions of Windows...
It was every version of IE and Windows. Thats why XP, 2003, Vista, 2008, and 7 users all received out of band security updates for it.