Well, you have to look at what a power clean is phase by phase. They build traps because when you rise onto your toes you shrug as hard and as high as possible. If you need explosive power for a sport, or train for strength, or just have an interest in cleaning, then, yes include them in your routine. If all you want is big traps, you can get the same effect as a clean by doing jump shrugs/power shrugs.
In my experience, most guys who clean have big traps, and this is because the shrug has to be straight up and as high as possible. Even if you stick with regular, old shrugs, make sure to bring the shoulders up as high as you can in a nice quick motion. I also noticed so many trainees who shrug their asses off to no results, and this is usually because they're shrugging way to much weight only 1/10th of the way up, they are rolling their shoulders all over creation, or they are so worried about squeezing at the top, that they are squeezing half way to the top because they are using a weight they cannot physically bring to the top.