Bart,
Regarding pace of play (at least over here and assuming a congested course), people tee-off as soon as the preceding foursome is reaching the green. It usually takes less time, however, to get to your driver's ball than it does to the people in front to hole out and therefore it is not uncommon to wait in the first fairway until the people in front clear the green. If the first hole is a par 3, people start the round more spaced out and in our club, we never have fourballs wait in any hole thereafter, whereas in other places, it is not uncommon to wait when the first par 3 is reached...
Mike,
I agree that in Puerta de Hierro, opening par 3s in both courses were the only alternative due to the ravine and the hill that rises behind, but my question was more from a conceptual point of view than based on our particular case.
By the way, the bridge is no longer there, it was taken down when the courses were remodelled and a cart path was built.....Bridges are now limited to the lower course (which was never used for the Open)