They just work, and they work well! When I got my first MacBook Pro, I originally wanted it just so that I could have a more well-rounded experience with other computer operating systems. At that time, Windows was the only one I'd ever owned, but I had a temp job once where I had to use a Mac. At the time when I got my MBP, I was studying digital/web design and was only familiar with Windows; it's not much different on a Mac.
Also, I have to say that I've absolutely had loads more issues using Windows than with Mac, including recently. In March, my Sony VAIO Windows 7 laptop, which I got in early 2010, died. I had my best friend take a look at it since she's a former programmer and extremely computer savvy and she determined that the motherboard died. That was a relief because I was able to purchase another Sony VAIO (for super cheap on eBay) that looks identical to mine except for the color and I installed the hard drive of my old computer to that one. However, earlier this week, I ran into that B.S. "This copy of Windows is not genuine" error and had to deal with that. The reason I'm rambling about this is because I've literally had zero issues with Mac in comparison. The biggest issues I've had with any Mac is the computer freezing maybe twice in nearly 7 years and the fact that I had to update the OS via a bootable drive (but that was my own fault for keeping it on Snow Leopard for so long, lol).
I know this thread is about Apple products in general (and I love my iPhone and iPad as well), but I just had to share my Mac vs Windows story.