Hmm, it would appear I was in the same situation. As a little kid I loved Calvin and Hobbes, and I read all the compilations. I discontinued reading them, but recently I found one of those books in the back of my closet, and it was fun to read it again, but it didn't make me laugh like it used to.
However, instead of finding it funny, I found it touching, and moving. More of the life lessons actually got through to me, instead of flying miles above my head.
So, on my recent read through, it made me smile, rather than laugh. Still, just as good.