One of my favourite exercises and I do them all the time at least once a week. The reason I do power versions is for the lack of flexibility (shoulders, upper back and elbows). I would do full versions also if I could but I don't want to spend endless hours of trying to achieve the flexibility (for me personally...its not worth the effort).
In the clean I'm able to do full versions but I choose to do power cleans basically all the time. For me in the full clean the front squat would be the limiting factor...so I feel that doing full cleans is not worth it.
On the other hand if ones aim was to compete in weightlifting then its a whole other story. Power versions would then need to be considered as secondary rather than primary lifts.
And yes my traps started growing out of proportion when I started doing power cleans and snatches (shrugs with much heavier weights and more reps didn't work at all for me).