It can't be reliably so answered, but it's often the best tool we have, and the thing to do when dissatisfied with quality of the best available option is not to discard it.

There are ways of improving the intuitions though, patching particular problems in them, and some even appear in this post. Continuity of experience is one such confused notion, which gives a good argument against immediate intuition in the relevant situations.

"Is it worthwhile for parts x, y, and z to go on existing with the rest gone?"

I am trying to figure out what it is that defines us, what it means to survive. That Sarah Palin and you both drink coffee or that some being with your name will be maximizing paperclips isn't it. Self-preservation seems to be an important part of rationality, or what is it that instrumental rationality is for? And if you can't recognize yourself then what about epistemic rationality? Of course, there is only the universe that is unfolding and no self, but that could be said about values as well.