Yeah. I've known people who have been on transplant waiting lists.
I intend to live to such a ripe old age that few of my organs would likely be useful anymore, but not everything goes as intended. As a contingency, I filled out a donor card years ago. Anything that can be put to use should be put to use, then they can mulch the rest and use it as fertilizer to grow something nice.
I also donate blood regularly, because why the hell not.