I only 'upgraded' one laptop and reverted it after a week. It still tried to do the update until I did the bits detailed earlier.
It was the mandatory updates and the feeling of not actually being in charge of what software was installed on my machine that finally swung it, this was above and beyond the bits about scanning all your files and happening to pass the list to an American organisation that looks for copyright infringements, or the fact your decryption key is uploaded to microsoft if you disk encrypt etc....