If you've been in the IT industry for more than five or so years you probably remember predictions like "This is the year of the PKI". In fact, for a number of years this was the prediction each new year! Again, if you've been in IT for a while you know that the year of the PKI still hasn't come. Well, as evidenced in the picture below you can see that EuroDisney has implemented smart cards for guest room key access.
Mickey, in case your listening: I'd suggest spending more money on better food - like real eggs - and less on smart card enabled room keys.