Just done MAN-AUH-SIN return and all security was efficient and relativity quick. From experience, the queue, however large, flows at a good rate and one's frustration doesn't build.
Ironically my longest wait was in the T3 fast track! Traveling to SOU and stuck with business class AA pax with everything as hand luggage and a first class pax deciding which of his very expensive toiletries were destined for the bin!