It all depends on what you do with your computer. My daughter and son in law are both techs, they spend 8 hours a day on computers. Neither one of them can make heads or tails of this setup. My computer is loaded with image edit programs. Any change to the OS means a lot of work saving and configuring those, if they will work at all. I also have some music I like, IE7 turned my soundmax control panel off, I can't get it to work at all.
I'm on firefox now, don't really like it but it's better for me than IE7. IE6 was just fine, I liked it.