@Pineywoozle I can't speak to the duck therapists. Mine have mostly been qualified to work with humans.
Regarding the synesthesia - I don't know why it is so tantalizing to me. I am very familiar with aphantasia. I'm not afflicted with either of these, I don't believe, but aphantasia is something I can see/understand and let go.
But synesthesia, I think it is jealousy. The idea of looking at a string of numbers and seeing or hear the hidden meanings... that would be amazing.
I would imagine programmers specifically would benefit. Debug must be like sifting through clouds and cascading rainbows!