Macs, don't forget, are also used in (almost) every single recording studio across the country. I say this as someone who has been to many of them! The software and responsiveness and lack of internal 'lag' and latency issues makes them very good. Every windows equivalent and every time I've recorded with a windows PC (top of the range, most of them) they have failed and have serious latency issues.
(just to say, you need ZERO latency to record anything)