I think we did at one time, but it became seen as something fuddy-duddy, something your mom made in 1955 while wearing pearls, living the perfect suburban life, and slowly dying inside.
I do think it's somewhat coming back, though, as a kind of retro dish that the young folks have rediscovered and are updating a bit with other trendy things.
As for the rotisserie chickens, it's not that people don't eat them as a whole chicken, they do (I have); it's just that it's likely just as common to use it as a pre-prepped ingredient for something else. I'll get one, strip it down, chill it overnight, and make chicken salad the next day, for example.
I'm thinking back...I know my mom definitely roasted chickens. We raised them and had a lot of chicken. I think mostly, though, she'd boil a chicken for soup and chicken-and-dumplings.