It was sort of a gag. I originally had a ton of barrels where I stored everything myfrom my quarry but then I switched it to DSU's. He commanded me to make one for every minecraft resource... I went with it as a joke. It's true I can use ME disks for storing everything but there were so many steps just to make one high end disk that I preferred the simplicity of the DSU's. This way i can store crafted stuff on the ME harddrives and my resources in the DSU's. I am pretty short on quartz at the moment too, but I may switch back to more harddrive space after I quarry some more...
If you are already using AE it is pretty easy to set it up to auto-craft any size cell you want. And there are actually relatively few steps if you do them all at one time (I am in 1.4.7 so I have fabricators do them for me in the early game anyway, so that helps a lot for me).
That being said, DSU's are great too, and given how much you have of some of that stuff it apparently wasn't the worst idea ever.