>>what was then called structured programming
Actually, the structured programming ideas were pretty good.
They were primarily aimed at COBOL so many of the ideas no longer apply.
One of the key ideas was that unless code is reused, putting it in modules just for the sake of modularity makes the code less readable and adds no value.

That's still true.

XBase and languages like it made SP largely irrelevant tho,
One of the basic tenets of SP was the elmiination of the GOTO and there IS no GOTO in XBase.
I'm not sure about Basic tho. Did some variants keep the GOTO alive?

One of the SP tenets that I see violated all the time is the notion that a module should have one entry point and one exit point.
The elmiination of GOTO took care of the entry point, but when I see XBase and .NET code with returns sprinkled throughout the module I still shudder.
I know that it's sometimes more efficient to have several, but it still makes sense to me that there should be only one exit point and that's how I code.