Thanks for this amazing list, rd95.
I agree about Get Smart. Amazing show, and it still gets laughs to this day.
Personally, under Cartoons, I'd also put Beavis and Butt-Head. It's dumb and crude, but it is a fantastic satire of teenage life, and it is just a hilarious show in general.
I agree, there's so many great shows out there to whittle it down to a single show. I put Quantum Leap there because that's the one I've been watching recently. There are many more that I regard as classics.