I notice that I intentionally try to avoid portraying myself as "smart" these days because it frees me from having to work to prove it externally. I've also started working on hobbies that others don't consider meaningful, but which I notice challenge me as much as anything else I've been called smart for.

The upshot is that a lot of people in the workplace /do/ judge you anyways, and people seem to assume that you (like them) are doing your darnedest to appear as impressive as possible. Then again, I am working in high finance.