I actually used this priveledge this weekend, in MSP. The process is relatively painless. You call up the club, on the direct number, and tell them that you would like to arrange a business meeting. They ask you for all of the important details, like your club number, and the time of day you expect to be at the airport. I showed up at the airport, went to the designated line, which with NW is the elite line. Went through security, and then to the club. No one escorted me, and I do not have to reserve a conference room. Since I pay for two club memberships, and use them for business, this is a priveledge I think is worth having. Often times I am able to meet a client who is transfering through MSP have a meeting for an hour or so without having to pay for an extra trip. This is also benificial, because if they had to leave security you wouldn't necessarily have the time to hold a meeting, and re-clear security. I think the new rules are good, better than the just show up and show your card. I hope they keep this priveledge. BTW I saw the list on the day I went through and there was a grand total of 5 people on the list, so my guess is that a lot of people are not going to go through the effort of calling ahead and making the arrangements. THat is just been my experience with it.
Of note I know that UA has not extended this priveledge to non-traveling RCC members.