It's no more significant to me that the brain handles different "choices" in different ways than the fact that my fingers move differently depending on the task.

>“We” are our brain.

Okay, but what about global supervenience across both time and space? What are we not, if we focus on integrated systems of cause and effect? That's the more important question. "I am a very special cog" does not negate "I am part of a larger machine and my movements are dictated by all of those other parts, plus energy that originated long ago."

I hardly think we need to debate whether the concept of free will is useful. The overwhelming majority of our moral and legal systems depend on the premise that it exists, and anyone who tries to prod at that premise gets shut down very quickly by nervous, fearful, vengeful, and outraged people. It's certainly useful to some people and to some ends. The same could be said, however, for any opiate of the masses or tool of the oppressors.