How much do you think about a book when you're not reading it?

I have to say that, despite a strong start, "Wolf Hall" does not "stick" with me - by which I mean, I don't think much about it when I'm not reading it. That's a good gauge, I think, of the power and influence of a book. How much do you think about it when you're not reading it? Books that I'm very absorbed in, I find myself thinking about the style, the characters, the story - when I'm driving, in the shower, wherever. I want to talk about them. I wish I could do that more - think more about what I'm reading, talk more about what I'm reading - but the press of daily life pushes reading into a corner all too often. I feel that so much of the reading I did when I was younger was just to have read the book, to check it off - I didn't think enough about what I was reading, I was just moving on to the next book. I'm more reflective now, which is good - but still too much of a Type-A reader. Anyway, Wolf Hall just doesn't do it for me, and I'm not sure why not. It's well written scene by scene but the scenes don't add up to much. It's as if it has a veneer of being important, significant, because, hey, it's a big deal to be reading about Cromwell and More and Henry VIII, surely we're learning something. But really, not much has happened. I think of some other historical fiction I've read - Gore Vidal, say - not that I loved his Lincoln or Burr, but you really see how these men made public policy, what they wrestled with, their crises of public life. In Wolf Hall, Cromwell has not done anything of interest - offered good advice, played a key role, even observed anything of great interest or complexity. The one saving element so far is that we learn or observe a lot about Cromwell's family background and domestic life, an area usually ignored in historical film and fiction, esp about a long-ago era. Perhaps the book will pick up in the 3rd section.