Craig Hockenberry seems to agree with me in regards to multi-tasking:

There’s an inherent benefit to only doing one thing at a time: the load of worrying about other tasks is lifted. Knowing that there isn’t anything else competing for your attention is quite liberating. […] I suspect that we’ll all benefit from working in Pages, Numbers and Keynote without the distractions of the web, Twitter or chat. And in the long run, we’ll prefer it.

He gets it.