I've had the past three generations of Samsung folding phone (4,5,6).

My use-case is for travel, where I want to read books, and the very occasional time when I want to do some design work outside the office -- draw a diagram that sort of thing. A third rare use case is where a web site is buggy or limited in functionality for mobile browsers. In all these cases the unfolded screen allows me to do the thing I need to do without carrying a second device (tablet, eReader). Another marginal use-case is to show another person a photograph. The fold out screen is much easier to see and I think has better color rendition too.

For these use-cases I find the folding phone very worthwhile.

But...the benefit that trumps all that is that the phone itself is smaller (narrower) than the typical flagship phones these days. It fits in my pocket and my hand reaches across it. I'd never go back to a non-folding phone for this reason alone, even if I never unfolded it. In fact I almost never do unfold it, except when traveling.

fwiw it wasn't until the Fold6 that the "cover screen" typing experience was ok. I understand that the Fold7 is a bit wider and so probably better, but I can't justify the expense to upgrade so will sit out until the Fold8.