[Strilanc]

In quantum computing, I can implement important effects using the measurement operation. For example, I can reduce the number of Toffoli gates used during an addition by measuring at particular places in the circuit. From this we can easily see that measurement must matter a lot in quantum mechanics, since its presence allows you to reduce the cost of certain tasks.

No one has postulated a "conscious measurement operation" with additional useful effects beyond the measurement defined in textbooks. (Well, okay, Roger Penrose says things that kinda sound like that, but that's pretty fringe and beyond the scope of quantum mechanics.) In fact, there's literally no known experiment that a person or a machine could perform that would distinguish a "conscious measurement" from the usual mechanical measurements quantum computers use. That is the sense in which consciousness has nothing to do with measurement.

IMO quantum mechanics really doesn't have anything to say about consciousness that wasn't already present in classical mechanics. Instead of saying "but how can an assemblage of gears experience an outcome" we're saying "but how can an assemblage of superposed gears experience an outcome". It's just the same hard-problem-of-consciousness confusion dressed in new clothing.