I'm mac and I can run unix/linux applications.
I only have one use for windows: Internet Explorer
If it wasn't for that single crappy application I would not need to keep vmware installed. But I'm a web developer and I have to test IE.
Otherwise, the very sharp looking and solid notebook design, applescript/automator, bash, textMate, photoshop, actual multiple desktops, and access to a huge multitude of unix/linux applications without the weird hardware problems of running linux on a notebook make enough business sense for me.
I am a gamer, but I'm no longer a PC gamer. I've kinda mellowed out on gaming long before I got my mac. I moved over to the wii and now the 360 (i'm a rockband 2 drummer whore). I've gone from hard core rpg and fps games to social games I can play with a group of friends and some beers (smash bros, mario cart, rockband, etc). I have to say I really enjoy the change. I've lost weight, I have met new people, I'm happier and healthier.
Granted none of that is because I own a mac. But I just keep that in mind everytime I think about building another huge windows machine for gaming. I've actually saved a lot of money after I bought this mac. I used to build a new Windows machine each year. It would cost me on average about 1800.00. I would take the old machine and hand it down to my wife and take her machine and make it my linux machine. I would then take that machine and sell it or part it out and maybe recap a few hundred. So my net would be around 1400-1500. My macbook was 2500. I am upgrading the hard drive and ram next month putting my total cost around 2700. I have no plans to upgrade for at least 3-4 years. This makes my cost around 700.00 a year.
Again I could of kept windows and stopped the gaming cycle, but most of the tools I use for my job are linux tools. My work uses linux, so I can match them in version and config on linux and know it works. When I write a bash script to automate a task, it works at home and at work. However, I wanted my computer to be a notebook, and after testing a few dells from work I was simply not satisfied with the state of linux on notebooks (most wireless problems). I bought my macbook pro fully expecting however to put linux on it. I just never expected to be so satisfied by the mac OS.
Honestly, I started off impressed, that turned to annoyance, and eventually turned into a love of this OS. Sure there are things I would change, but overall my experience was much better then the hacked together windows + cygwin development environment I had previously.
And windows is a good OS. I never had problems with my windows machines (besides poor 3rd party drivers now and again). I grew up in the unix world and I prefer the unix way of doing things. I need multiple desktops, I want constancy in my applications and tools. My macbook provides a happy medium. I find myself wishing my linux machine was more like my mac and not the other way around. I can do all the stuff I loved my linux machine for, and the stuff I wanted to do on my linux machine (such as photoshop, flash, good multimedia support, good wireless support, itunes (yes I love itunes, even on windows), and good multiple desktop support. Plus I can use my beloved open office and have access when needed to actual micosoft office (although I mostly use iWork now).
There is no reason to switch your operating system unless you are not happy with it. I think this latest microsoft campaign shows that they made some mistakes in the marketing or design of vista and they are losing customers. Apples marketing is compelling and really at this time the only place for those customers to go. I think microsoft will do what it needs to do and fix the real of imagined problems with vista and end up being a much better operating system because of it. I also think eventually apple will become to controlling for me to handle and I will find myself yet again back on linux (and hopefully my notebook complaints will be only a faint memory).
So be whatever kind of operating system lets you do your job the most efficiently. But don't think for a minute that you are superior to any other operating system out there.