For Malaysia, I think that there is no stringent checks first,
they won't check every vehicles that leaves the country.
As for the 50+ counters, I believe that the immigration officers
(not ICA) are offline or very busy. (I mean offline is that the
immigration officers are not working now or taking a leave/vacation
break.)
Even the cars are also using the M'cycle lane at Woodlands
Chkpt, some vehicles trying to cut through in between the
lanes.