Originally posted by CrazyCarl
I agree that 95% of people in these organizations do not get much out of the experience, but they are definitely worth joining if you decide to make the most of it. If the club at your school is apathetic or uninventive, get involved, get elected, and start running the club the way you think is best. You will have dozens of (usually responsible and committed) pre-meds at your disposal, at the very least. Radically readjust the mission, scrap the discussion groups you dislike, and direct all that people-power toward community service or something similarly useful.
No one will be impressed that you joined club X. They might be impressed if you can say "I thought club X could do more, so I got myself elected president and transformed it into a worthwhile organization."