Yes, tabs that popped open.What do you mean by pop-up folders? Spring Loaded Folders are there, have been since Jaguar. So I guess that means you mean the ability to dock a Finder window as a tab/drawer to the bottom of the screen? For me, that was a neat parlor trick, but never a core part of my Mac OS Classic workflow.
What was a neat parlor trick to you was a space saving method on a 17" single screen. It allowed me to have multiple server share folders open and the ability to drag and drop between those server folders as well as between them and my desktop. With OS9, all those open folders took up valuable screen space (and you couldn't see your desktop). There was no Exposé then either.
And it decluttered my screen by keeping unused windows compact. Combined with spring-loaded folders it worked really well.
EDIT: Here's an example in 2013 I posted for something else. This is the left screen of a dual monitor PowerMac G5. It's a 24" monitor. All these open windows are folders on active server shares. This is clutter. Popup windows would have alleviated this. But they never came back so I've just learned to operate this way. And it's one reason why I hated Apple so much for limiting the size of Finder windows.
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