I've read some of Dennet's essays on the subject (though not the book in question), and I found that, for me,his ideas did help to make consciousness a good deal less mysterious. What actually did it for me was doing some of my own reasoning about how a 'noisy quorum' model of conscious experience might be structured, and realizing that, when you get right down to it, the fact that I feel as though I have subjective experience isn't actually that surprising. It'd be hard to design to a human-style system that didn't have a similar internal behavior that it could talk about.