I just upgraded to Windows 8.. it took some tweaking but you'd never know I had upgraded from appearance alone. With Star8, I was able to configure Windows to login directly to my Desktop. I have a Start button. I rarely see the Metro UI unless I go to the app store or run MetroTweet.
Now, with Blue, that will be a different story. Luckily Star8 is only $4.99 since it will be rendered useless. But, I also read that the taskbar will become more functional on the Metro UI which is good enough for me as I am a minimalist and prefer to pin my commonly used apps on the taskbar.