Usually, NO I don't use them, However- on a day that I've trained heavily with free weights, it's not unusual for me to use them, because for some reason using heavy weights sends my appetite THROUGH THE ROOF.
I've backed off of the weight training because I was only losing about 1/2 a pound each week and I need to lose about 30 pounds, so for now I'm only doing aerobic exercise and I won't eat those activity points.