I too miss visting the flight deck but since 9/11 for obvious reasons, I don't even ask now.
However the visits spurred me on to get a PPL so now I can do some flying myself . So if you are really interested and don't currently have a PPL, I strongly suggest you go and get one, it will be a very interesting and rewarding experience.
Another option, although not a cheap one , is to pay to fly a simulator. Virtual aviation provide this but be warned, its £600 per hour! Very easy to get addicted though!