When crApple finally fully wall the Mac, only the true fanboys will still use one 
or, those of us who have to for work..... a goodly pile of "must have" professional audio production software and hardware ONLY runs on Mac.... or, even more commonly, only runs PROPERLY on the Mac... and similarly for video and graphics....
i'm unimpressed by "lion" i have a copy installed on a drive, but won't be using it unless for some reason i have to use something that is lion only...
i'm also leary of the forthcoming iCloud.... i've been a happy mobile me user for a while, syncing studio and office macs and my iphone wirelessly for all the mundane useful stuff.... with the changes they're implementing, i stand to be a good deal less happy.... won;t move till next july when they cease Mobile me altogether...
always thought of the iPhone as a bit of a gimmick until i got one..... then I discovered all the work related apps i could run on it... and it suddenly made sense....
Ditto the iPad.
(for example, iPad can act as a wireless version of a certain well known DAW hardware control surface, total cost, about £500 for the iPad and app, as opposed to £1199 for the hardware , AND it's mobile, not tied to the desk by wires.... makes it something of a no-brainer )
got to say though, was mighty impressed when i first got my 8 core Mac pro with 16GB of ram.... the amount of grunt on tap is ridiculous...
and for someone who remembers paying ££££££ for a very early 10MB HD, frankly, the cost is pretty reasonable

i would not count myself as a fan boy.... i tend to be too cynical about new shiny tricks, when all i want the thing to do is work.... which unlike so many PC's i encounter in my support role.... it does.... solidly, without fuss and bother...
and anyway What's a virus?

i do however, get a bit defensive when i feel PC nutjobs are being unreasonably aggressive about Crapple in general....
ultimately they produce good hardware, with a decent stable operating system.....
it's just a bloody computer ferchrissakes.... there's no real need to be actively anti either platform.