Earlier quoted context omitted.
As someone who has traveled for a long time, I find two things to be true: 1. People like business travelers or those with even minimal levels of status/benefits (who don't pay for checked luggage) don't usually preferentially check bags because luggage gets delayed, it's harder to switch flights when there's a weather etc. problem, and they have to wait at the luggage carousel. 2. Hard and hard-ish roll-aboards are…
For me it's not having to wait at the carousel at the end, it's having to wait in that enormous line at the beginning. I really don't understand why they make it so much work just to drop off your checked bag before the flight.
At Copenhagen Airport, I usually get off the metro, walk to the luggage tag machines at the end of the platform and scan my passport (or boarding pass). That prints a bag tag (and boarding pass if requested), so after sticking that to my luggage I drop it off at the counter — I put the bag on the scale/conveyor, it scans the barcode, prompts me to press "Confirm" that there's no explosives etc, and I'm done.
I scan my boarding pass to go through the barrier into the security screening, walk to the gate, and very often scan the boarding pass again to get onto the jetbridge.
I can easily go from the metro to the plane without interacting with anyone. I understand this is Scandinavian bliss.
(Exceptions are trips to countries where I need my documents to be checked; e.g. to go to the USA a checkin agent has to see my ESTA visa waiver. Oddly, going somewhere like China which requires a printed visa in my passport does work on the machine, as the machine prompts me to scan it.)