It's just an impression from my own life. 3-5 years ago, lots of people around me used Linux. Many of these same people now use Macs. Not exactly scientific, I know.
Honestly, this article made me realize how much I take it for granted that all of the LCD projectors and dual-monitor setups I've encountered in the last half-decade have just worked with my mac. I thought back to 1999, when I got my first Xinerama dual-head setup working with X11 after about 4 hours of work...
xf86config? Oh the pain! One of the video cards was running at 50hz in 15-bit color mode. Madness.