I'm not quite buying the speed of play issue. My only experience was this one round and from what happened on our card it slowed it down if anything due to shots from the drop zone ending up OB. Then again tee shots that went OB right off the tee did get to throw from the drop zone, so kind of hard to tell. And I'm not so sure on the penalizing issue either due to a player on the card going OB off the tee shot then twice more from the drop zone for a triple circle 10.
I have played drop zones on mandatories where there is one obstacle that must be passed correctly. A 400' OB line is a bit different then a mandatory though. There are also many holes at SP and at other courses where the OB is pretty similar. Why put a drop zone on this one hole? Ray did say he has played drop zones before on OB's, but in my somewhat limited experience I have never seen this happen before.
I really am not trying to make a big deal out of it, but in my honest opinion I do think it is stupid. And with the way I throw I don't normally even go over the OB. My tee shot ended up pretty close to the drop zone. It was my uproach shot that came about 2' short of clearing the OB and then having to re-tee from the drop zone. If I had know the course a little better I probably wouldn't have to worry about the OB. So even though Jorge would like to disagree, it really isn't just about me and the one time it came to bite me in the ass.
FYI, don't be surprised to see a bunch of signs posted at Quail Ridge next time you play there altering the way holes are played, "just because" I want to...hahahahahaha!!!