To be fair to the UI, there's also an 'Eject' option in the menu bar when you've selected the disk. There's also a keyboard shortcut. Dragging it to the trash is just more fun!

Actually, if memory serves, dragging to the trash was a shortcut for ejecting AND... what did they call it... putting it away, I think. Normal eject would leave a ghost of the floppy disk so when you inserted another one, you could copy from one floppy to another. You had to 'put away' to remove the ghost.