Too be honest I understand you feelings! Donating your organs is a good thing to do, yet I am not doing it myself, I also do not want other people's organs though, so I think that is fair! ....plus I want to be cremated, so nothing will be rotting or waiting for the worms!
But yeah, you have the right to choose and that's a good thing!

yep. i have my drivers liscence ticked that if i die in a road accident they can use  whatever usable body part or organ they scrape out of the wreckage. the body is just another vehicle to be left behind when i die. they can cremate whatever is left over (if it wasn't already cremated in the road accident) or give it to medical science. at least my death then served a greater purpose than just dying in a stupid road accident.

I think it's great. Enabling someone else to live when you're dead. 
In my country, everyone (except Muslims) is automatically listed as an organ donor unless we choose to opt out. Why not? It's a wonderful thing to do. (:

Also, I think about it from the other POV. What if someone I loved was dying and needed an organ transplant? I'd be grateful to the organ donor. 

I would do it, and then have the remainder of my body cremated and planted under/with a tree. ... or send my ashes up in a firework.  

Im listed as an organ donor...it's too logical not to participate in, but it irks me how selfless it is.

would you rather your heart rot in the ground with your corpse? 

well, if it saves another person's life, then what's the problem? It's a self-less and honorable act of love.

Honest question- is it more creepy to think about your organs being in someone else than it is to think about them just rotting in the ground?