I'm another that loves "What a Wonderful World."
Never thought of it as a funeral song, but I may consider it, also. I've always wanted "I Come To The Garden Alone" to my parting song, mostly because it struck me deeply when my paternal granddad died and it was sung at his funeral... maybe because his was the first death I experienced in my family (other than a still born sister).
I still love that song, though... I remember listening with a stirring heart as Elvis gave his rendition when I was a child.

From sex to funerals... does this say something about us...lol.