Aero Mad,
Security, just for starters, might have changed since your ESH-ACI days ... Checking in baggage, security questions, then emptying pockets and/or being frisked thru security, taking laptops from bags, "what's that bottle of water and/or that sharp object doing in your bag maam?, then going for a p1ss or indeed a No.2, then walking out to the aircraft, then starting engines whilst safety briefing ... Yep, all perfectly reasonable within 15 minutes!
And Pontoise ain't anywhere nearer to Paris since I last posted