Steve made a comment on getting the oil in the rear end heated up. The rear ends today are so strong that you seldom see a failure with them. I remember well that back in the day, you'd see a (front engined) T/F car make a pass, and the rear end would break a couple of hundred feet off the line. A good driver could catch it & get off the throttle before the engine zinged to the moon. The rear ends were out of a passenger car; nothing like today.
Gives you an indication of why teams rarely do throttle whacks anymore - lots going on and I imagine throttle whacks just make the warm up procedure not conducive to good performance. Now, there are teams that give demos - Kalitta (for sponsors) and Tasca (annual car show in Cranston, RI) come to mind - and whack the throttle. But there is no racing on the line when they do that, it's for pure entertainment.