In the UK, the students at Bournemouth are still sent to BA for a short course in Airline Ops and CRM. Included in this is usually 2 jump seat rides to either domestic or european destinations.
The opportunity to attend a Sim check has grown since closing the door to the flight deck, and has been utilised by several that I know of - but at the end of the day its down to whether the crews are comfortable with you sat there. Nothing can beat the thrill of a proper flight though