Here was our experience last few weeks....
Landed at CDG on 7am Monday morning 6/22. Regular scan line was going fast, but because we had a 6 and 10 year old, we were put in the longer line. There was a plane from Ethiopia in front of us with 2/3 windows open and it was going slow. There was a 3rd line for business/first that had no one it. I went and asked if my premium economy made me eligible for that lane, and they let us. Saved us 2 hours for sure.
Coming home, we flew from MRS to Frankurt. In Frankfurt we had to clear before we left. At one point, we were in a line that didn't look too bad and a Lufthansa employee came up and asked any US passport holders to follow him. About 50 of us followed him through the airport while he held up sign like we were on a cruise ship tour. Wound up in some other area, where we had had to go through 2 other stations. The guy told us that it should be quick, but their wifi was bad so every passport took at least 30 seconds to come back. All of it felt very unclear and made up on the fly but it worked.