Nobody ? It's the other way round for me. Not all, but lots of Python still makes me laugh and while I find the kitten cute, I never thought that sketch was remotely funny.
If Python are less funny now than they were its because so much comedy has mined that surreal/absurdist style of humour since then and it's not as surprising as it was, but there are aspects of satire to Python's humour (about religion, class, gender roles) which still makes much of it work for me.
I didn't grow up with The Goodies, so I haven't seen that much, but what is supposed to be quite so hilarious about the kitten/King Kong sketch has always been a head scratcher for me.