I do not like raisins in anything either. I don't even like them in oatmeal cookies. When the kids were little I would bake cookies usually once a week rather then buying cookies at the store. When I made oatmeal cookies I would add either chocolate chips or chopped nuts to them but no raisins. I remember when putting raisins in apple pie was popular, I thought why ruin a perfectly good apple pie.
I don't know if I have a favorite, but I love Corn, Chocolate Chip and Lemon Poppy muffins. In regards what not to put in a muffin, I don't know I think cheese whiz would be gross, but hey, that is just my opinion.