BKK is a very long airport, with two wings (East and West) protruding into the airfield. At both of the intersections there are (at least) two transit security points. One of the points is big (3 lanes or so), and the other one is small (2 lanes). I recall that the 3-lane setups had big lineups while the 2-lane setup had almost no lineups since they were not as obvious to find.

The 3-lane setup ios split into 1 MD and 2 MMW. The 2-lane setups have 1 MD and 1 MWW, with the MD lane "reserved" for staff...

We were able to go through BKK without using the MMW. If you refuse, they will send you to the other security point, and you simply have to choose the correct lane.