Back in the day, our machines (2000, 500, SX-1'd CD32, 1200) always had 2 floppy drives, even with hard drives installed. Backing up disks, installing multidisk programs, and moving files between machines in the pre-network days was made much, much easier with multiple drives.
Now that CD-R, Ethernet, and disk imaging are common, I get by fine with a single drive.
