If anything I'm too much the other way I guess. I've got about 3Tb spread amongst different machines and formats. USB/eSATA/NAS and just plain old harddisks in different boxes on the local network.
I tend to waste disk space making duplicate copies of copies of important folders, then promise myself I'll get around to sorting it out later. This of course rarely gets done...
Still, better too many than none at all I guess.