I believe I ordered my laptop before iLife '08 was released, hehe. As for familiarity, I was comparing OS X to Windows in general; the transition from XP to Vista for me was perfect (I switched over last October during the first release candidate).
Anyway, sucks to hear about the bogged-down PC at work. I personally never install anti-virus software on my own (non-shared) computers; I never really browse or download anything questionable or untrusted, and haven't had a virus since when I was a silly 11-year-old using my old old Dell PC in 2001 or so. Haven't had any spyware turn up in years, either (Vista comes with built-in anti-spyware that runs nightly; Microsoft Defender). Comparing times on the same computer, I'd have to give the startup speed edge to OS X (after all, it's an Apple laptop), but Vista boots up damn fast comparatively. :]
And I am so proud of you, biff!
I'm much happier with an Apple laptop than I would've been with a Dell or HP or something; the hardware's super-excellent and everything's so clean, mean and fast.