I'm glad my first post was useful, and would like to add my own opinion, now.
I think huge boxes are a waste. The last game I bought was "Undying", and all it had inside the big cardboard box was the CD, a registration form, a quick guide printed on a folded letter-size piece of paper, and a booklet - not realy a manual, but a story background - about as big in size (not as thick, though) as the New Testament books some churches spread around campuses. I hope most of you'll know what I'm talking about.
Having collected games for many years now - although you can say I'm biased, "doing" primarily FPS! - I found that manuals are useless most of the time. Someone mentioned the ADOBE products, and I found that they have some of the most useless manuals I've ever encountered - and boy, those things are HUGE! So, in any case, big manuals are not necessary better.
I appreciate tight packaging, without it being excessive. A good example would be what's going on at this point in time with CD jewel cases. Instead of the traditional ones, manufacturers have now begun pushing for "ultra-slim" cases, which are useless as far as I'm concerned, because I can't fit any inserts there - and to add insult to injury, they didn't even follow the older CD-single case format, which at least allowed you to have useful information on the spine... Now, I see that DVD cases were made to be equal in height with VHS cases - although they could've just as easily fit them in regular CD cases - but I can live with that.
I don't like big cardboard boxes, though, and as far as I'm concerned, games can come in either CD or DVD cases, and that is enough - you can still fit manuals quite nicely in there, thank you very much. More does necessarily mean beter, and I cringe when I think about the amount of wasted paper rotting somewhere at the outskirts of the city. I remember a joke (?) saying that the amount of paper consumed in communist and capitalist countries was similar - in the communist countries every form had six copies, and you were supposed to make huge reports on anyone and everything, while in capitalism, they use the same amount on wrapping stuff and junk mail.
Next time you want big boxes, take a trip to the nearest landfill and see for yourself what excessive packaging means. Even if you think it doesn't affect your whim ("I want big, empty boxes to brag about"), it will affect your life indirectly, in terms of pollution and urban encroachment (has anyone calculated the surface of landfills for the six largest American cities?)