I wouldn't use them, but then I was "taught" how to expertly pack a case by my parents. I guess its considered an old fashioned method - every few years a "new, wonderful method" pops up and packing cubes seem to be the current one.
I've helped friends pack for extended stays and when they pankcked about nkt getting everything in, I showed them the way I do it and got twice as much in their cases as they did - by just folding, packing and.stuffing small l things into corners and shoes and it arrives with no or minimal creasing .