As Eu citizens we get used to the free travel we have in between EU countries. Little more than a cursory glance at a passport and you're into France, Spain, Greece etc. Although wh share many aspects of culture and language with the yanks, they do not see British or EU citizens as any different to anyone else and don't share the EU open borders. It is quite a shock to find slow immigration and detailed scrutiny of your passport, followed by a few questions about where you are going and for how long etc. when you go the US for the first time. Anyone would have thought that Americnans didn't want tourists to visit. In all honesty, I dodn't think they care less what we think as foreign tourists, because the bulk of their tourists come from within the US. Problems are rare if you fill in the cards correctly and answer their questions. As for when your plane lands, that will determine the speed the queues go down, but expect at least an hour. I endorse everything Rekstout says above.