For me a go to thing to smoke is a pork tenderloin, 20 minutes to throw a marinade together, throw it in a 2 gallon bag overnight, next day get the smoker going, and while its adjusting to temp I pull the loin and pat it dry, throw a rub on it, throw it on and 2.5 hours later it's done for a 8-10# loin.
I like it because it doesn't take a lot of time, it sets up easy, it's pretty forgiving, and it's good eating. My favorite thing to cook though is baby backs, there's just something about them, the look, the drying sauce creating a killer look with the bones etc.