It may just depend on the time of the day and the days you traveled, but I've never experienced any prolonged wait for morning departures at the DL pier.
In both cases on the past month (around 6:45am and 8:00a), the priority line was virtually empty and the ID-checker immediately available, but no carry on bag-size police.
I always try to keep to the left as that is usually the most direct and fastest screening lane.
Of course, a post-security SC would have been been a nice idea. @:-)