I had a Supernatural set tour on the day they were filming the season six finale. Met both of the boys, and they are both insanely gorgeous. I obviously knew going in that Jared was gigantic, but we met Jensen first and he was still taller than me, which just made me think, "Jeez, how big must Jared be then?"
Jensen is private as a person. Very friendly, lovely guy, but just not going to let you in too close. He's had bad experiences with crazy fans, I understand. Jared is more open, and we actually hung out in his trailer for a while.