Not really rhe fingerprint machines issue, more the in person chexks on the way back.
Did malaga in December and April, December once fingerprint on machines, 5-10 mins on the passport check, back the same.
April -/going there, OK 20 mins as we had the kids, coming back, horrendous we arrived 3 hours before, the passport queue snaked though the whole departures area, took 90 mins, but luckily we arrived fairly early. And still had 20 mins before boarding. fair play to the staff for trying to manage immediate flights and letting people cut the queue.
Madrid in December was beyond horrendous in the way back, no help, the passport control snaked round and dealing with long haul and short haul passengers. Eu queues empty with 5/kiosks and officers staring blankly whilst 3 kiosks for the rest of the world , we jumped as best we could and ran for our flight, many people didn't make the flight. Didn't have the kids this time round..would not have made it