Goes to show how much we've come to embrace change in the last couple of decades. Software was coming on ~50 floppies before we ditched them for CDs. Nowadays, things never get that bad before a replacement is phased in.
Unreal Tournament 2004 got up to 5 CDs and Half Life 2 I'm sure had seven. Apart from that, I've never seen anything even approaching what you guys are saying about old windows OS installs.