I think the security screeners and immigration staff at Heathrow are leagues ahead of any similar organisation in the USA. I have only ever found them to be polite and as efficient as possible given the circumstances they have to operate in.
Still, I look forward to skipping happily up to to the Immigration booth at Newark next week humming one of those unforgetable Disney songs and declaring to the nice inspector "People like you who don't Think probably don't have Brains; rather, they have grey fluff that's blown into their heads by mistake...tra la la......"
He will laugh mightily and say "Winnie the Pooh, right?". We'll then part the bestest of friends that friends can be.....
Or might I be a little optimistic....?