I know many people have complained about it, but I have always personally liked the mixing of arriving and departing pax. It's a much more pleasant experience for arriving passengers, from my perspective. Rather than being funneled into a dark, boring, gray corridor with tacky corporate art or Kodak moments hanging on the walls... you get dropped into the buzz of departing passengers with the shops and restaurant and so on. Plus it simplifies things so much, especially when transferring. BA passengers seem to love doing point runs to AMS, because it is so easy to turn around.