It's a mix of finally finding a product that satisfies your needs perfectly with the pseudo anti-establishment that comes with it. People complaining about apple fan boys is just as cliche as the fans boys themselves, and it just fuels the fire.
OSX + the great community of developers creating apps like 1password and Textmate, is what sold me. Looking back at my experience using windows for over a decade I have a lot of negative memories.
At the same time I don't like 90% of Hollywood (CGI-fest) movies but it does a good enough job to satisfy most people. So I don't bother convincing people otherwise in the same way I don't push Apple on other people. I just support it when the topic comes up.
