While I actually I agree with you, I'm not so sure it's necessarily a negative thing. For example, I probably wouldn't have done most of the things in undergrad that I did if I didn't feel like it would be a good experience to list on my app. I was that guy. The thing is, though, that once I got started with those experiences, I really did grow to love them. They were very formative and insightful, and I'm extremely grateful to have had them. I'm just not the kind of person that goes for joining random groups and doing things. It's just not how I would naturally spend my time - and in medical school that has borne out, as I'm one of the guys that's halfway involved with one organization vs. the same pool of people that are seemingly on every "important" group or committee. But I don't think that reality makes my experience any less genuine.
But perhaps I'm off base.