I've only been to France once, via Eurostar, and the French immigration officer at St. Pancras in London was talking on his phone and just stamping passports as people went through without even looking. I guess he figured that if you're good enough to enter the UK (since they usually do quiz you about your travels when arriving) then you're good enough to enter France.

My experience at Berlin-Tegel arriving from LHR was also very similar. A quick "guten tag" and a "danke" (which, along with scheiss, is the extent of my German ) and 10 seconds later I was through passport control.