I will say in the last 3 or 4 years Duxford really got the traffic control down, the disabled/airspace can only go left etc where most delays were caused by all traffic having to be stopped so a few cars could turn to the M11 so things are far better now.
Both going in and coming out are far better but you need to go early as I said to get a good place.
My friends dad loves Duxford as it denies him nothing in normal days or at shows as long as you don’t mind pushing him around (-:
I will say he was happy they reversed the no free carers policy as it is a lot of money for one day and he is a friend of Duxford as well.
Curlyboy