We did the online checking for our arrival on 08/12 and it worked great. There is a special line (though I don't think you necessarily have to use it) - it's at the far end of the desk. We checked in right around 3pm and there was no wait. They handed me a packet with everything in it (including our Keys to the World) and gave me a quick rundown of where I was going, and we were done. Very quick and easy.
We got home this past Wednesday and I promised myself I would write a trip report, but I've gotten bogged down in reality!! Hope to write one soon - we had a fantastic trip, and FW is now our favorite place to stay!
lklasing, I have to thank you - we read all your trip reports, and that helped us make our decision to stay at the Fort....