The first instance I can recall of another film aping SW in this regard is the first Pirates of the Caribbean film. I could be wrong though. Still, that’s a nearly 25-year gap, which itself suggests how unusual SW’s opening once was.
You haven’t seen a single film from 77-03 that didn’t have opening credits? Hell, even just two years later Apocalypse Now didn’t have any on screen titles whatsoever.
Not to mention SW was far from the first film to do this.