GS is a bit overused and if you're able to deal with it appropriately, it can be painful for them.
GS A can be ducked + small punish or Einsatz'd.
GS K can be blocked + small punish.
GS kBE can be blocked, ducked + decent punish or JG & Einsatz'd for 2 full bars of meter.
I can usually tell when a throw is coming, but they will catch me off guard occasionally. I try to 9K when I sense one coming for that CH.