The concierge in CGN was very helpful: met the flight, on return walked around the lounge letting us all know, individually, that because the flight was a bit late, we should wait in the lounge, and then again, individually, let us know it was time to go through customs.

At EWR, when I really needed one, there were none to be found. No one met the plane, nor were any in customs. I'd planned a 4 hour layover in case the flight had to stop in Gander, and wanted to switch to an earlier flight. No concierge there to help - that would have been a great service.