WDW has new advanced scanners, they no longer have the bag/no bag lines.
They now have advanced scanners. Even with a bag, you just walk right through. Though truth be told, if your cargo short pockets are full, you are more likely to get asked to visit the secondary screening. Security also tells everyone they should take umbrellas out of their bags and hold them out in front. Umbrellas and some similar metal objects set off the new scanners, but it is okay if the person holds them out in front.
People are used to having to stop for the scanners, that is why they tell people to keep moving. Most people just walk right through.
The only people now separated AT the scanners are those with a wheelchair/stroller. If you set of the scanners, you are ALSO detained. Usually off to the right. Then you have to clear your pockets and wait to get scanned with a wand.
In the meantime, people who have successfully cleared security walk away, so there is a STREAM of people moving through. that is how/where people get split up.
If you enter with a small child (not detained), but you are detained, those who clear security are pressured to keep walking. A child might walk some distance before they realized mom/dad was not right behind them. That could be upsetting for a small child or someone with a (cognitive) disability.
Mostly it worked fine for us, but once someone in our party was detained for secondary scanning. I'm not sure how to say, but if you are cleared, guards do not allow you to join the person that was asked to do secondary scanning. For most adults, that is fine, but it could be upsetting for many.