SS is an awesome utility. One thing that's great about having a bajillion classes to 50 is having insight to how certain things go. For example, the Ultima Weapon in Praetorium. I keep SS up on all Melee DPS. Why? Because if it absorbs all of the damage from his pulsing attack, they don't get knocked back. DPS that aren't knocked back are doing more DPS. So indirectly, I'm increasing the damage of the group by doing such.

Another time it is really useful is on a Gladiator, Paladin, or Marauder (not Warrior), you SS before a 3+ mob group and you have a REALLY easy time holding agro. You won't need heals for a few seconds and that means no healing threat going to the healer while you work on gathering them up.