<<I would have thought they would have had better things to do>>
Not really. The one left in the Flt Deck can do the paperwork, make any radio calls to company etc.
<< but either way it left a good impression>>
That's the idea...
If they have their hat on as well, it's their annual Route Check.
In general, more keen to come out if the landing was good... and hope someone noticed!
NoD