Until I have huge amounts of money to burn (or Apple changes substancially) I will never own a mac os based computer. They are hugely expensive for what they are, I can see the appeal of having a pretty laptop, but the small eepcs (or comparable) running Linux Ubuntu are just as fast and aesthetically pleasing as a macbook, and are hundreds (in some cases thousands) of dollars cheaper. Sure, if you were particularly naive you could get ripped off worse with a PC, but it's a lot easier not too. I can't comprehend why macbooks need so much power to run such a simple[footnote]I can't think of a better way of putting it, I mean low resource.[/footnote] system, and I also hate that, despite the massive price hikes, the quality and customer service are way below par.
Like every non-steam rabid computer gamer, I use windows (currently windows 7) for gaming, it is, without doubt, the most powerful gaming platform. It has the best support for the most cutting edge software (new tech always makes it's far to Windows well before Mac OS, and while it's usually available on linux as well, there isn't much demand for high end, cutting edge hardware on linux systems). So yeah, I have a gaming laptop running windows 7.
I've recently gone to ubuntu for miscellaneous computer tasks (largely because of how segregated windows has become, I need to install seperate browser, office pack, media players etc) and it just suits my nerdy habits of constantly reformatting and re-allocating systems on my desktop better. Outside of specific things that need windows OS[footnote]the same applies to mac OS, however there are differen't specific tasks.[/footnote] (gaming, solidworks etc), I don't understand why people ever bother(ed) with it. Current builds of Ubuntu are far better suited to email/office work (they don't create new version of software that aren't backwards compatible, they aren't good for gaming[footnote]read distracting for workers.[/footnote], it's less susceptible to viruses[footnote]as the OP said, you have to be somewhat uninformed to get many anyway.[/footnote] and most importantly, it's free![footnote]there's a very real chance I'm overusing these things.[/footnote]