I was the kind of child who would scare myself by thinking about the concept of infinite space and time. I knew that the song was a metaphor for death. The song disturbed me, and disturbed me very much, and the fact that Mother Duck was re-united with her ducklings at the end of it did nothing to change my opinion of it. Clearly, Mother Duck was dead as well.
I wish I could remember how old I was at this point in time. I know I must have been fairly small.