Am I suffering some kind of confirmation bias, or does Spock spend an unusually large amount of time expressing emotions, for someone who's supposed to never express emotions?

100%

So much so that I’m at the point where I’m still wondering if this show is still canon.

I really like Strange New Worlds. The episodic nature with overarching storylines is the right direction for Star Trek, but really wish they had used this cast to make a show with a new crew in a new ship set post-DS9.