We used it on Monday just past. We were there at about 10.30 am and they have 2 check-in agents, one security guard and 2 baggage handlers with 2 lorries that wern't even 25% full.
We were the next in the queue and there seemed to very quick. We were on the 20.40 flight so we spent til lunchime in DTD and the afternoon in Mall at Millenia. Arrived at the airport just after 6pm and walked straight into the security check, bypassing all the rest standing at the ordinary check-in.