Maybe it's just me, but there's something so computery about the 5.25" floppy. Something about this thin sheath of plastic, with its label in the top left resembling a stamp on an envelope, as if I am somehow posting a letter to the computer when I slide it into the drive slot. Silky smooth and near silent as it enters, displaying a higher degree of elegance and purpose than a 3.5" disk and the clunk of the drive as it goes in (unless it's a Mac). And don't get me started on the anti-climax of inserting an SD card.
Like the comeback of vinyl, I wish someone would come up with a new removable recording medium that looked and felt like a 5.25" floppy, but would fit modern data requirements and be able to store several hundreds of GB.