I always read these type of threads and it is interesting to me to see what "other extra stuff" people bring with them.
I have been cruising for 20+ years and have never brought many of the items mentioned and to be honest, I don't remember ever missing them either. Never brought duct tape with me or a highlighter. Never brought anything to hang over the door or clothes pins. Never brough a phone lanyard or sticky notes. Never brought stain remover or a power pack. The only time I can recall bringing a poncho with me was anytime I cruised to Alaska.
I guess I am just a minimalist. My only most important things are my passport, a couple of credit cands, some cash and my meds. Different strokes for different folks😀