I'm constantly impressed by the number of highly intelligent, mature people who post here, and I'm often surprised when I find that many of them aren't old enough to vote or even drive. I don't really find it intimidating as much as refreshing.
But I do find that it keeps me on my toes and makes me think before I post - usually.
Edit - I think the main reason the community is so great here is because of the moderators, who have continued to enforce Eric's rules of courtesy with a great amount of fairness and diplomacy. Thanks guys! (and no, I'm not kissing up to the DM, PCat)