Hmm, I don't feel the same way (like I'm a single core processor). I'm not from the US, though.

I often feel like I've gotten stuck for a bit on a main project, and it'll help me to stay away from it a little bit by working on a challenging distraction project. That gives me time to mull over the main project (mostly not at a conscious level), which will often be easier to get traction with after I've made some progress on the distraction.

So perhaps I am single core, but with a pipeline design. ;)