Yes, a little, mainly because the pads on the disc last so much longer, I tend to favor using it a little more heavily even when I'm trying to just bleed a little speed. When I had rims front and back I'd use them both about equally.
If I use the fronts more heavily, I've noticed that I can make my brakes last about the same front and back. I'm now replacing both front disc and rear rim pads once a year.