I'm not sure what "mac-friendly" could mean, but there are many Mac users and I've heard that Mac is very popular among the people in the designing field. (I believe Mac is much advanced in that field and spec is more suitable for a very heavy software for CAD, 3D designing, etc.)
Though I myself is using Windows, many of my friends are using Mac.
There are several Apple Store in Japan, and if you go to one of those mega- lectronics shops (such as Sakuraya, Yodobashi, Bic, etc.) you'll find a special sales floor or space for Apple products (not only machines but many software and so on as well, and of course, iPod!)