I'm very selective about my raisin eating. I don't tend to like them in desserts, but love them in savory dishes. A lot of cuisines utilize raisins in this manner - North Africa and Mexico immediately come to mind.

I think the issue here is ultimately about texture more than flavor. I don't want a chewy raisin in a rich, melty sauce. They're good in kugel, which are also made of noodles, but the texture is very different. They're springy, tender, and solid. Much more welcoming of raisins.

Beyond that, I don't really want any major modifications to my mac and cheese. It's comfort food and part of that comfort is how familiar it is. I don't really want anything in there. Even something like bacon or tomatoes, both of which would probably taste really good. Mac and cheese is just one of those things that I want to enjoy simply. Additional ingredients would only detract from the experience.