Many years ago, after the new terminal was built the airport had the then standard problem of cars parking up while the drivers waited for passengers to come out of the terminal. They would take every inch of kerbside and could sit there for an hour or more so the only place to drop off was in the middle of the drop off lane. The airport then got the towns traffic wardens to patrol the drop off zone but they were wimps and as long as the driver sat in their cars they would do nothing so the problem remained but the point to note is that traffic wardens have patrolled the airport CTA in the past.
The last drop off zone with the single lane and U bend used to have people employed to stop passengers crossing the pedestrian crossing so a few cars at a time could escape but even when that practice was stopped to be honest it made no real difference.
This time when the staff are on the ball and are looking over their shoulder at the available spaces in the first lane they just direct traffic further along so while the first lane gets blocked with the hatched parkers cars are forced to use zone B or C so are not held up if they have avoided the first lane but it does require someone to stand there directing traffic away from the first lane.
The real issue is the shear amount of traffic that travels on the dual carriageway that then has to get into a single lane and then at a slow walking pace do a sharp 90 degree turn where they see for the first time rows of drop off lanes with the first lane immediately to their right so they have no time to take in their surroundings. There are no signposts telling drivers that there are I think 5 or 6 drop off zones which is another reason why everyone would use lane 1 if allowed.
One major blunder is that the bridge over the pedestrian subway is only 2 lanes wide and as a coach and lorry lane has been coned off to avoid the queues there is only one lane available for the drop off zones even if they decide to alter the road layout to put in an extra lane for direct access to zones C onwards after the bridge.