Adding our data point. Entry into FRA from US flight. Arrived around noon and headed out via train to Mainz. Entry into Germany took about 15 minutes. No kiosk, just stood in line and agent looked at passport, typed a bit and stamped passport. No questions, photos or fingerprints. Easy to pop down to the train station from there.
I think that there are different experiences based on if you're entering Germany at FRA versus transferring elsewhere in the Schengen. My guess is there's lots of transfer traffic coming off the US flights so EES experience during mornings can be different if you're transferring versus leaving FRA airport.
Exiting FRA back to the US took a bit longer. We didn't have a line to use a kiosk, so that part took about 2 minutes. Then stood in line for about 30ish minutes to meet with an officer. Again no questions, just looked at things and then stamped passport again and off we went.