Can you separate belief from labelling someone prohpetic/visionary? I label a dog a dog because I believe it's a dog. I don't call a cat a dog with plenty of skepticism. I'm not going to give anyone the label of prophetic/visionary, even with plenty of skepticism. As a non-mormon I consider the prophetic/visionary concept to be fiction, and won't use it on anyone because I don't consider it possible - skepticism doesn't even begin to enter the equation - and labelling someone as something I consider them not to be would be odd. I might just as well label them president.
Sometimes we are labeled. You may label yourself Harvard graduate as much as you want but if Harvard says you aren't then you aren't. You may call yourself a Catholic but if thevCatholic Church says you aren't, you simply aren't.
Sure you can. To give an example outside of Mormonism, you can say that the Oracle at Delphi had a prophetic / visionary role within ancient Greek culture, without having to believe in the Oracle's prophetic visions.