Just because it's never happened to you on OS X or Windows doesn't mean it doesn't happen. OS X 10.6.7 broke the output on my 13" Macbook for either of the two external displays I own. Both worked fine previously, when booted from the install CDs, or from Linux on the same machine.
Plugging in my Firewire audio interface on the same machine spun the CPU up to 100% and kept it pegged there. A lot of good having a nice mic pre-amp does when you get a high pitched fan whir added gratis to all of your recordings.
It's silly to pretend that Mac is somehow perfect in these matters. In my experience it's only been marginally better than Linux, if at all. And with Linux you have some hope of finding a solution, whereas for OS X you're pretty much hosed.