Used to go every show every year in the early '90's when I was building and the social exposure was great, however nothing got done on the layout while I was gone. I have a rather busy weekly schedule so, in losing a Friday once or twice a year, York lost it's appeal to me.
I now buy the membership every 3 or 4 years just to go to York however on the way home, I usually regret losing a work day.
There is really not that much different to me from show to show.