OK, the slides themselves are the 'microfiche' (microfilm). The layout you've described is a 'grid'. It works well when you have a nice 2-dimensional system in place (Author/Title) but it's terrible when there's more to be filtered on (Artist/Album/Oh shit what now).|
It's actually worse on the XMB because the first dimension is always the category e.g. Music so based on the design philosophy - and this is what they actually did initially - they should return every single music track on the system. The folders are the end-result of this problem.
I'd urge you to play with an Apple TV (it's just what I've got in the house so I know it proves my point... don't paint me as an Apple fanboy). The music app, for instance, allows me to dig down N layers of meta data in any logical order I want to find the song/s I want to play. And because the whole device is built around the same UI philosophy I never feel like I'm being yanked from one app to another; which is exactly what the PS3 has to do to offer any real functionality whatsoever.
As nice as the XMB was to start with, it was actually a very short sighted design, it just can't accommodate all the data it needs to nowadays. They'd be completely mad to build another grid based menu.
2600, SMS, MD, GEN, 32X, MCD, Saturn, DC, NES, Famicom, SNES, SFC, N64, NGC, Wii, PS1, PS2, PS3, PS4*, Xbox.