I totally understand how you feel, but I think I disagree. After I'm dead, my body is of no use to me. I'm gone. Like Elvis, I will have "left the building". I'm not an ancient Egyptian and so I neither believe in the afterlife nor in my body being of use to me there. And bodies are definitely a boon to science and medicine; they help the living! What can be more uplifting than that?

However, if the body of a loved one who has passed away were to be treated without respect, it would upset me a lot.