I forgot about the thing I found most annoying in Amsterdam... I had a layover there on my way to England and it was no problem. Spent some time online and then boarded my flight about 30 minutes before departure as usual. However, when my husband and I had a layover there on our way to the US it was different. They called everyone for boarding 1 1/2 hours before the flight! This was because everyone had to go through an interview to get on the flight! I've never had this happen. Everyone lined up... they had two people doing the little interviews. When it was our turn we stepped up (if you were flying with someone else they talked to you together). They asked who we were to each other (just bf/gf at the time), how long we knew each other, how we met, why we were going to the states, etc. Then he wanted to see our itineraries and he was giving me a really hard time because I didn't have mine with me. Well, I didn't need one because my flight info was the same as my husbands, obviously. Anyway, once you went through the interview then they released us all into a different part of the airport. We waited around there for about 45 minutes before we got on a bus and were taken out to the plane. Loooong boarding process!
So.... if you ever have a layover there on your way to the states, find out when they want you ready to board before you go anywhere!