Actually, Jim Banke was talking about that on our local radio station. The Saturn 5 stack was one third again as big as the shuttle. Also, the difference between thrust to weight was much closer on the Saturn 5 and therefore you physically experienced the sound for a much longer period than with the shuttle which books out of there like a greyhound in comparison.
The Saturn 5 was very slow getting started. Must have been designed right at the weight limit where it wouldn’t even move until they burned off a few tons.