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 :-)
The baby lounge at Schiphol is amazing. There are small sitting spaces and cots in individual curtained off pods. Also a kitchen area to warm up milk or food. Brilliant.
If you have to get a boarding pass for joint KLM/Aeroflot flight: don't go to T5 (Aeroflot), they're useless. Can't even look a flight up by number! T4 are much better (KLM). Self check-in also works
Airport has a lot of interesting places to kill time. Areas to sleep. Its a lot of walking though. And every thing there seems expensive / overpriced - don't believe the "Special Offer"!
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're just passing through, have lunch/dinner before you go through passport control. The food is much better than it is in the international terminal!
The free wifi sucks. If you have the time head over to the KLM loungefree wifi. You have to be business class to enter but you can still chill outside and pick up the signal. Password> KLMddmmyy
Picking people up from arrivals costs money, one can actually pick up people from outside departures only when timed right. Parking prolonged at departures is not allowed and strictly enforced.