would you be a donor?

I do understand the anguish of patients sometimes dying for the want of a transplant, but I am not sure about the whole procedure being right for the patient and right for the donor. I wouldn`t like to think that my heart is pumping in someone elses body long after I had died. I`m not religious at all but get an uneasy feeling that whatever exists after death, one might be excluded if part of me is still `alive` somewhere else, a kind of limbo? What are your views on this please?