Me and my girlfriend always watch cartoons whenever we have some time to spare.
I never liked the idea that cartoons were something everyone would eventually have to "outgrow", I think that's a negative stereotype. Most cartoons are written with more adult viewers in mind, and of course I tend to gravitate more towards those.
Programs like Adventure Show, Gravity Hills, and Regular Time we enjoy, since the writing is often quick and witty.
Avatar: Wind Kid was very well-written, and posed a fun and interesting premise.
Many of the [adult swim] toons kind of suck IMO. Animated sitcoms like South Place, Family Man, and the Simpletons were great in their earlier seasons, but anytime something goes on for too long the quality slips. I'll enjoy an earlier-season episode or two.
I may never stop watching Disney and Pixar animations. Wreck-it Ralph was the shit.