On the other hand, being afraid of ending up with similar feelings like you, I keep stuff.
So I sit here in a room where I'm probably one or two arms-length away from VGA and DVI cables and other relics, "just in case".
Which is to say those might become useful someday again... Are they worth storing is a different question - since I'm looking for the cables anyway - both of the cables you mentioned can be bought for $5-$10, and the mini-usb I need is as cheap as $3. It will cost more more in shipping than the cable. (though I will likely look for something else I need to get free shipping)
OTOH, it's a large, loud, heavy, and ugly IBM 3590 tape drive that I'd rather not need to have at arms length to use.
Another reason they call me the cable guy at home ( though mainly because I probably have at least 800 cables in my studio )