I stopped using butter when I make sandwiches for me, since the bother of getting butter out- buttering- putting butter away was not worth the small amount it adds to a plain sandwich (personal sandwiches are ridiculously plain). I don't dislike it as such, just not like it enough to go through the small amount of extra work. (Btw. I use 'butter' as a verb even though I don't often use real butter- butter substitute, blended or similar. That seems fairly common, as it's awkward to come up with another word for applying your not-really-butter.)
I will butter for other people though, and if I buy a sandwich, it's expected and I don't mind it.
Gooey condiments are the bane of my sandwich-eating existence. In supermarkets there are *very* few options without mayonnaise (yes, buttered as well) since it stretches out fillings and makes costs lower... but mayonnaise is one of my top Condiments of Terror. Ketchup, mustard, salad cream, brown sauce... I have a genuine fear of them. It's more a texture/appearance than a taste issue; mayonnaise doesn't taste that awful and I can stomach it if it's sparingly mixed in, but I'd rather not. Similarly I like the taste of mustard but can't eat it unless it's seeds or I've made it myself from seeds.
So, I am quite firm on any 'butter vs. goo for lubricating sandwiches' argument.
However! I am also firm that there needs to be butter on a chip butty. Otherwise, why bother?