If you're totally pissed off and frustrated trying to get behind the gates, instant relief can be found by awarding the service a big fat 1 at the voting machine. Payback: it helps a little :-)
If you don't have bags to check, go around the big mess of lines directly to the passport checkpoint. And there's no waiting in security lines since security checks are done at each gate.
If you get stranded miss your flight, join and do not leave the queue for the transfer desk, no matter how many helpful numbers they give you! Call, but do not leave the queue. From Experience.
ATPI Schiphol balie, at your services, buy tickets, assistance on short term change of travelplans, every day from 06.00 AM -22.00PM opposite check in row 9 KLM departe lounge 2 Schiphol Airport