It must just be me but I can't recall ever running into boosters in BO II, granted I play KC basically exclusivly so it probably isn't the mode for them anyway.
I've run into several boosters in hardcore Kill Confirmed. The worst was on Mirage about a week ago. I never could find where they were boosting. One guy on the other team called in three VSATs, EMPs and Warthogs. The last place person on my team was on his friends list.