I noticed after my arrival here in the US that I was being pressured very much more than in Europe to hurry into position and get airborne... Not just where you'd expect (JFK/LGA/LHX etc) but at airports where traffic was almost a novelty... " traffic 3 mile finals / cleared immediate.. " why the rush ? The next arrival is still 150 miles away. I often thought.. sooner or later this unnecessary pressure will cause someone to roll without flaps/slats whatever... a quick look at essentials prior to rolling can only be a safety factor... At the really busy places we usually have to queue anyway which gives us plenty of opportunity to cast around for anything out of place.