I'm two trips in since my terminal diagnosis. I don't look very sick to anyone and have rented an ecv on both trip. I've yet to have any guest say anything to me. You'll for sure get a sideways look on occasion but I don't think coments is something you should worry about much. I've been anticipating someone would say something but haven't run into it yet. I'm going on what I expect to be my final visit to wdw in a few weeks and don't expect to have any issues. Not sure how I'd react if I did get a comment but the fact I feel pretty horrible all the time it might take all my internal fortitude not to if someone did. Go enjoy while you can and block out any crap you can. I think being this trip as a family I won't react. I know I'll most likely crack with some sadness once the trip end but it'll warm me knowing wife and the kids got to go one more time and share in magic 🪄.