it somehow seems to happen much more when folks attend a CFAR workshop than when folks spend a similar amount of time with similarly intelligent people in other contexts

The similarly intelligent people are not necessarily rational. You could find hundreds of highly intelligent people at any university; a dozen of them would be extremely intelligent. But most of them seem like they have no desire to self-improve (generally; not just in their knowledge of the subject they specialize in); although they may profess that self-improvement is a good and noble goal. Actually, the mere fact that they already are successful in what they do, may alleviate their desire to improve.

Meeting intelligent and epistemically rational and instrumentally rational people... is still probably better in a context that makes it obvious that one is supposed to learn from them. If nothing else, the students are not ashamed to ask.