While meeting many student groups would seem like it would take a lot of time, it ended up being about the same as a lesson prep + lecture time (there is needed prep and recovery time in lecturing).
People also need to realize, college instructors aren't paid to teach. They're paid to research and so of course they'll be lazy on sharing what they've learned from teaching. Universities have teaching centers, but those can only do so much when you really need to also be talking to fellow instructors in your specific field since every topic can't be taught the same.