I also have Win 7 on my new desktop PC. And I have Linux on my old laptop. (I originally intended to replace Win 7 with Linux on my new desktop as well, but after I got it home and used it, I discovered that I rather like Win 7; and since I paid good money for it, I didn’t want to just throw it away).
As for Win 8, I see value in having all devices (computer, smart phone, tablet, TV, GPS, refrigerator, toaster, vacuum cleaner, etc.) all have the same interface.
On the other hand, a computer is more than just an appliance. While it’s okay if you see the same interface upon turning it on, I still want an option to get to the traditional Windows desktop and use my computer like a computer. If the desktop is gone, or buried under several obscure layers of “motions” to get to it, I’ll stay with Win 7 (or, better yet, Linux).