Waste of good plastic, virtually no space, you'd need 4 to 6 of them for a single photo or song. I've got a pocketful of flash drives, what do I need these things for?
If you don't have any classic systems, none whatsoever. If you actually do own some original amiga machines still, then they do have their occasional use, especially if your HD goes west.
That said, the last time I had a HD boot issue like that, I put the offending HD into a PC, fired up winuae and corrected it from there. Not a floppy in sight.