Supposedly "we get the intuition that in a copying scenario, killing all but one of the copies simply shifts the route that my worldline of conscious experience takes from one copy to another"? That, of course, is a completely wrong intuition which I feel no attraction to whatsoever. Killing one does nothing to increase consciousness in the others.

See "Many-Worlds Interpretations Can Not Imply 'Quantum Immortality'"

http://arxiv.org/abs/0902.0187