Can't remember how many times my brother and I spent time in the cockpit on our flights - parents flew a lot . . . We received little 'Pilot' booklets with stamps in them, pins etc... Exciting times for kids . . . sadly not anymore.
Having said that, flew XY with the pilot being my neighbour from two houses down and we spent a few hours chatting up front . . . which was a bit annoying as he got me upgraded to First and I couldn't enjoy it much, being in the cramped cockpit!
Curses!