Nothing new here. With close to 30 trips to Europe from the mid-90s to 2004, I had a grand total of 5 entry stamps during that period. Except for the UK - I was primarily entering via FRA or AMS - I rarely got more than a nod or a little hand gesture to proceed when I held up my US passport. It got to the point that I didn't even slow down my walking when coming up to the immigration booth; I would just hold up my passport, make eye contact with the immigration officer and head on through.