Camels and the "Scare Horses" attribute

How effective are the camels in Rome Total War at really scaring cavalry? I have a Seleucid campaign, and hired some Bedouin mercenaries, and was wondering just how much the "scare horses" attribute really works. Obviously cav units with less morale would be more affected, but is it really a boon to have camels in my army, especially if I am somebody besides a phalanx faction? Since I am Seleucia my phalanx and cav situation negates the worries about enemy cav (not much stands up to Cataphracts and Companion Cav).