Hand 1: I reraise more PF... at least $8. (3x the raiser's bet + $2 for the caller) maybe $10 depending on the VP$P of the two players.

I probably reraise to $12 on the flop, to see where I'm at... I think the turn check is ok, after everything else.. and the river is acceptable given the previous action. I don't go with the cheap showdown all that often.. but I'm probably leaking with over-aggression.

Hand 2: Given what we know of the opponent, I think he could make this play with any pocket pair and think he's got you owned... The river is a bit of the scare card, but he's been aggressive before it came out... so I think your Queens are good here. With somebody this aggressive don't you want to build a pot PF by reraising... ??