Thanks for thomq for the clarification. I also thought this was some kind of rant how big the old desktop PC cases were, and I was like "Were they (bigger than nowadays)? Umm, ok, if you say so, maybe nowadays there are less card slots needed inside, mostly just for the graphics card...".
Anyway, GAME BOXES, yes. I thought they were ridiculously huge already back then. Two of the worst offenders I personally recall were (and yes I have mentioned these earlier several times):
Leisure Suit Larry 5: The cardboard box was bigger and thicker than most other PC games of the time, but there were just some floppies and some thin manual inside, IIRC. Lots of wasted space.
Journeyman Project Trilogy: My god! It was a huge cardboard box that you couldn't hold in one hand, you could probably fit a newborn baby inside. Yet, the CDs themselves were only in some thin and flimsy cardboard envelope or such, and if there was a manual, it wasn't a big one either.
I guess the only reason for such gigantic boxes containing little was to get exposure on store shelves. I really preferred the later PS2-like DVD-boxes that became common also with PC retail games, they were much smaller and of the same size all the time (easier to stack them).
I originally coped with the big game boxes by buying one or two extra multi-level shelves for them from IKEA, and keeping them there. Even that was not enough in the end, so I started keeping the least used ones in cupboards which were really meant for clothes.
Later when I moved out of the apartment, I didn't want to even think of moving all those game boxes too... so instead I got rid of almost all the game boxes, keeping the game media (CDs etc.) and manuals only in small plastic bags. I only kept a couple of the boxes, the fanciest ones that were more like works of art.