The behavior mapping of Collections / Outliner for the Blender 2.80 is complete. It is believed that all prior capabilities / conveniences are still possible, though not exactly the same way.
First, in 2.80 any number of named collections can exist. The rule that child objects do not necessarily have to be in the same collection as a parent meant that when displaying the outliner in View Layer mode, it is not possible to show parent / child ordering.
It is recommended that Scenes mode instead be used, unless actually moving / dragging objects between collections, so that parent child ordering is possible.
The exporter now uses all 4 of the little Icons next to each object. These settings actually map pretty well to the same thing in BJS. The custom exporter properties pickable & disabled have been removed.
If you wish cull a single object from the export, just turn off its Monitor icon. If you wish to have a whole bunched not exported, then you might create a 2nd, 3rd, 4th collection, maybe named Hidden Collection & drag these objects to it while in View Layer mode.
The exporter now also checks if an object’s parent is being culled. When a parent will not be exported, the child will be exported as a top level object, instead of generating an invalid file. Armature, Camera, & Light objects also need to be visible to export.
Finally, a reminder that a disabled object in BJS also applies to that object’s children, so even though you can have an enabled child of a disabled object in the export, it is still not going to be visible.