They had already been busy before the changes that were introduced last year.
Those changes obviously mean two things:
Firstly, more nationalities qualify for visa exempt entries - and extensions thereof.
Secondly, many if not most of those who would have gotten a tourist visa before and would have gone to the main Chaeng Watthana office to extend are nowadays entering visa exempt and have to go to Laksi instead.
Mayhem? Maybe. Very busy, especially between holidays? Certainly.