Except at work where I am forced to use Windows XP, I don't touch Microsoft Windows anymore. My home systems all run Debian GNU/Linux as do my family systems that I am responsible for. On my way into work this morning I was thinking of why I don't use Windows anymore.
When you think about this list it is a very similar list to what Windows users say when someone suggests they upgrade to Linux, except their list is inverted (except the security - even Windows users know that Windows is insecure).
I do not think I could ever go back to using Windows now, which is interesting considering that I used Windows before Linux and for a longer time span.