TNG was laced with good humour, that was never really the point, but was always there in the background. It added a realism to the show for me. In fact, I think it helped bridge the gap between TNG's perfect humans and us, the viewer. They could still crack a joke. I think DS9 and VOY followed suit on this too.
As for TNG, so many scenes I find very funny and frequently quite warm. The entire cast can be amusing, yet they all vary in delivery from blatant wit to dry sarcasm.
One of my favourites is from Picard....
"Im sorry if I interrupted another waltz..."
I laugh every time.
Also, I love the 'end-of-episode-laugh-on-the-bridge' thing that happened so often.
Damn TNG is so watchable.