I agree.. My home computees all used windows and like you stated once I was smart enough to figure out that you have to be careful and pay attention to what your doing I never used a antivirus again. I used a router fire wall and that was it.
again I don't care for mac oz. it's too locked down for me. I like tweakin and playing with my programs ans mac doesn't allow much of it without a bunch of mods etc. my son uses a apple laptop and as he has gotten better at computing he is slowly coming over to the darkside(windows)
also agree let any other os hit the amount of windows users out there and then you will see they probably have as many exploits as win7