Those who complain about the cult of Mac fail to realize how much the Windows platform has been helped by competition from Apple. Those of us who have been photographers for a long time realize that Photoshop was originally available ONLY on the Mac, which built a lot of brand loyalty from professionals early on. Long before that, the Mac pioneered using a mouse instead of keyboard commands; this made computer use for all sorts of graphics more accessible and easier; this engendered a lot of brand loyalty from graphic artists of all sorts since the mid-1980s. Apple pioneered widespread use of Firewire and USB, which made peripherals faster and more reliable. Apple dumped the floppy drive first, realizing that media artists were going to need greater storage capacity. Apple's iPhone took the concept of a phone to a new level, engendering a stampede of copycats who pilfered the elegant concept. Apple developed the first modern operating system in 1984; it wasn't until 1995 that Windows users had a rough equivalent (and could trumpet "mine is cheaper!"). The iPad explores new territory, once again making the user interface easier and more intuitive to use.
My point is not that the Mac and Apple are necessarily better, only that you wouldn't even have your cheaper Windows equivalent if it wasn't for Apple paving the way. Apple's finest strengths lie in the user interface, the masterful blend of software and hardware, research & development, and, of course, design elegance. It is rare that a competitor trumps them in any of these areas.
As far as trying to impress people with computers: I don't. My computers mostly stay in the studio. But if you look at most art galleries, they use Macs at their public desks. Image may not be everything, but when you are trying to sell artwork to wealthy clients, you don't want to sport a Wal Mart level computer up front. Seriously.