“Extraordinary focus is only made possible by periods of intense rest.” -Amy Larson, amyjalapeño.com
I think multitasking is over rated. Sure it comes in handy, but in my book it is nothing to rave about. It can leave you exhausted with only bits accomplished and progress spread thin over multiple areas.
Lengthy intervals of focusing on one thing (with brief periods of intense rest) makes one an expert (and a sort of creative craftsman) in that particular area.