Transborder is shoes off, domestic and international is sanity. CATSA is generally much more civil, no shouting, often multi-lingual, and generally a calmer athmosphere. A few WBI machines exist but are not often in use (see the sticky) and opt out is an option with no retaliation. Selection is entirely random via the mat.

I am currently in an airport in Canada, next to an international checkpoint, and it is calm and peaceful.