My memories of the "Rock" were two very different ones. The first was the view of the drive-through from a low angle in the back seat of the family station wagon. I don't remember anything else (except the pleasure of the great-smelling/tasting food that soon followed). I must have been about 3 yrs old, and we lived on a dairy out by Kircher school, so this was on our way home. When I saw those posts of the covered drive through and smelled the fried chicken wafting out of the window, I was a happy camper.
Later, I worked for a few months as a night desk clerk in the last several years of its existence. I remember very little of that time, except how spooky that place could get at 2am, and the "build any kind of sandwhich you could imagine" opportunities of the diner kitchen's prep bar.
Eating at restaurants wasn't much of an economic possibility for us when I was growing up, I think I ate at the Supper Club once for some event (HS reunion?), and at the Crossroads twice.