For the original poster - don't be put off, because as echobeach says, the traditional way still works in LFAT.
When I first went to Le Touquet, some time in the last century, the only way of filing a flight plan home again was by writing it on a paper form and handing it to the person behind the desk.
Now as various people have pointed out, you can also do it on AFPEX, on your Blackberry, on a dedicated terminal, from the business centre of your hotel, and by telepathy probably. If you have one of these toys, this is great - I'm all for progress and alternatives.
Fortunately however you can also still write it on a paper form and hand it to the person behind the desk!
Enjoy your trip.