But y'know... I thought "Rapturism" was what all Christian churches taught and always had taught. I didn't know there was any other view of eschatology until I studied a little church history!

That's because the Dispie-Premil view is preached from the rooftops while the much older historical views are seldom even discussed in Reformed churches. The "Rapturist" crowd hosts "bible prophecy conferences" and "end times seminars" and stuff all the time all over the place. And Reformed churches don't place the emphasis they should, I think, on Christ's return.