Well as well as the creative side of things, Macs have a much more intuitive and stable interface.
And as for multitasking.....
Im on an oldish G4 Powerbook (1.5ghz powerpc cpu....the old ones) with 1.5gb ram.
Ive got Photoshop CS2 open, 6 dreamweaver windows, itunes (visualization runs fine too) about 10 FF winows, and all my instant messaging windows (msn and iChat[ICQ]) and then a good few notepads and entourage (MS outlook).
Still running smooth and fine... and thats with 5 users connected to my shared iTunes folder and a few downloads running in the bg.
I can't even imagine the power when I get my new 20" iMac
Macs aren't just for artists.
You gotta ask yourself, do you buy a ready made car that works as soon as it's delivered, and if (and unlikely) anything goes wrong, its fixed instantly by professionals for cheap.
Or do you buy parts for a car, it's gonna need tweaking constantly or it'll break, it'll need regular replacements and repairs and it'll break down often.
The only reason Mac users appear arrogant is because we get frustrated with the blind ignorance of windows users.