I'm sure if I spent time fighting with Windows I could get it to do most of the same thigns OS X does with third party addons and so forth. However, I'd still have the constant hassle of keeping my virus scanner, my AV and my ant-spyware up to date and I'd still be missing the GNU core I have on OS X and spend a lot of my time in.

I find I can get more done more quickly on OS X, hence I use OS X. What better reason is there to pick an OS?