The Mac install and uninstall procedure is the simplest in the world. Just drag the app into the applications folder and it's done. There are exceptions to this rule, but none of them involve poking around the core and whatnot.
As for linux being more user friendly, it's just as crazy as saying Man landed on the moon.
Yes, Linux does come with a lot of free and open source software, but it's the paid ones that generally kick ass. Take Adobe suite, Final Cut studio, iWork (paid office suite for mac which otherwise comes with a trial version), Logic studio.
@metalhead: didn't I just say that Apple has just rebranded AAC into their own container? Jeez.
As for mp3 being an industry standard, I will stand by my statement. AAC is the future for sure, but mp3 is here to stay, at least for the foreseeable future. It's widely available, supported, and most people have caught onto the name 'mp3' meaning digital music. It'll take a while for aac to penetrate. I personally rip in AAC.
And a small note: This is a Mac OS X vs Vista thread. Didn't realise how Linux came in