One thing I could never figure out is why they added more letters to the drives, A: is a lot easier to type than df0: and the sentences they used to make a diskcopy or copy a file. Later it just came natural and never noticed the extra key steps.
I like the Amiga's approach better because (like the Unix/Linux /devs directory) it provides a coherent, standard approach to enumerating physical storage devices, and it also provides access-by-volume-label, which is woefully underused. Single letters are convenient until you're choosing from half a dozen partitions and drives and trying to remember which is which without looking it up.
The extra verbage in some of the commands, though, is pretty unnecessary.
