Never actually been onto the flight deck, closest was LHR-BRU pre 9/11.
I had missed the BA flight due to horrendous queues for security, so was put on the SABENA flight. I think it was a 737. I was in business, front row, RHS, window seat with empty next to me, only about a dozen PAX in total.
Cockpit door was left open throughout the flight, but kept shutting, and opening again!!
I got a decent view when it was open!
I do have 14 hours in a PA28-140 (but then bought a house and couldn't afford to continue the flying)
Oh, and WAY to many hours on FlightSim (according to the missus!)
Cue the SABENA joke - Such A Bad Experience Never Again!