At about that same time, Hal Lindsey's "Late Great Planet Earth" book and movie hit the scene. They went a long way to popularize premillenial dispensationalist theology, but even so I can't recall a lot of discussion about the "End Times" in church. Lutherans tended to be a bit more pragmatic in their approach, at least the Lutherans I was around did.
When I went through a (thankfully brief) evangelical conversion/experience myself some years later, I attended first a Southern Baptist Church (where the youth minister told me I needed to be baptized again because Lutherans were "almost as bad as Catholics" and therefore my infant baptism didn't count) and eventually a non-denominational church in Austin. The Baptists spent a LOT of time talking about the rapture and wondering if the anti-christ was alive on earth yet, etc. It was a typical feature of the Sunday sermon, for example. The non-denominational group, not so much. Maybe in Sunday school, or as a special topic, but it wasn't emphasized.
So, the Southern Baptists being a very large denomination (the largest protestant group in the country at one point, I think, not sure today) I'd say the concept is very much an "article of faith" to US Christians, though not universal.