So, how would the docking queue work when you are smuggling illegal goods, or passengers for that matter.
A queue is the perfect way to allow authorities to scan you, if you happen to be carrying illegal passengers, well you know how lethal station security can be with the included might of station weapons.
Got a rush job gonna pay you an extra mile and you only have a few seconds to dock? Sorry, station is busy, you have to wait in a queue.
Running out of oxygen due to a broken canopy? Landing at this station is the only way you can survive. Sorry, you have to wait for that type 10, an Annie, type 7, python, 10 sidewinders and a hauler. (Death sounds).
Of course you could always override the queue, but then you have the same system that we have now...