Well, there are different kinds of immersion: forward-propelling, outward-propelling and inward-propelling.
Forward-propelling: This is the "page-turner" factor. "I must find out what happens next... RIGHT NOW"
Outward-propelling: pure fandom experience; sharing your love for the series with others
Inward-propelling: inspires in-depth analysis, predictions, etc.
I think you're putting more emphasis on the forward type, and I on the inward type. Most of the time, there will be a little bit of all three types, but different people enjoy their favorite stories differently. And even the same person may have different approaches for different stories -- or even the same story at different stages.