The places where I think Scottish bunkers are better are at the casual courses or council courses--something akin to a muni. I have not actually been to too many, but I have ridden by plenty on train and bus and noted that there are rarely flanking bunkers. The bunkers, if any, usually interject into the fairway or bank along the green (generally breaking up that line of instinct) and rarely seem superfluous. They are council courses, after all.
Many of the links and big name courses cannot quite say the same though. Some places are reliant only on bunkers, and they certainly over-do them. I would like to bring up the issue of surface area, though. Sure the Old has over one hundred bunkers, but a majority of them are 100 sq. ft. or less. In the two times I have played, I have been in the sand twice, and those are both because of just terrible shots on 9. I would say total surface area has more impact than total number of bunkers with placement having obviously the greatest impact upon play.