I'm not saying that didn't happen to you, but I would say not to count on that because I don't think that is the 'norm'...
Every time we have checked in when driving, or when we have not been able to use the gate with our room key, we have been asked to show ID. On check in day, they asked for one of our ID's (we didn't need our ressie #) they just checked it against a master list on a clip board then sent us on our way since we told them we knew where we were going. But in general we have not just been waved thru. I guess it must depend on who is working the gate and we must come thru when the 'Gate Nazi' is working.

Not that I mind at all... makes me feel a wee bit safer that they are attempting to see what business people are there to 'conduct' on property (obviously, not that a person looking to make trouble can't lie but at least they are making an attempt to monitor)