This nostalgia's all well & good, I have great memories as a child visiting the cockpit for take off, landing etc. However it's a vastly different world today. I think there are many, many more threats out there to flight safety than there ever were, terrorists apart. With the drinking/charter culture as it is now, it will never be as safe it was and therefore, for me, cockpit security is sadly a necessary evil nowadays. Way too many horror stories from flights all over the place to make me feel happy about an open door policy, even if it is a selective one.