Reading like a writer without ruining the book
Subject: Reading
The standard advice is to read as a writer: attend to the construction, notice the choices, take the sentence apart. The standard complaint is that doing so ruins reading, and the complaint is fair. Analysis and absorption use the same attention, and running them at once produces a shallow version of each. You neither get lost in the book nor learn much from it.
The fix is not moderation. It is separation. Two passes, kept genuinely apart. The first is for the reading, undertaken with no pen and no intention. The second is for the machinery, and it does not need to cover the whole book.
The first pass
Read it the way anyone reads. If a passage carries you, let it. The only discipline required is to mark, with the lightest possible gesture, the places where something happened to you: where you slowed down, where you skipped, where you were suddenly certain of an outcome, where you reread a line without deciding to. A pencil dot in the margin is enough, and it should take under a second so the reading does not stop.
Those marks are the data. They record the effects, and effects are the only reliable evidence you have. Technique noticed in the abstract is a matter of opinion; technique noticed at the exact point where it moved you is a fact about how the writing works on a reader.
The second pass
Days later, go back to the marks only. This is now a technical exercise on perhaps a dozen short passages, not a reread. For each one the question is the same: what is the writing physically doing here that it was not doing on the page before?
Usually the answer is unspectacular and mechanical. The sentences got shorter. A paragraph withheld the subject until its final clause. A description that had been running for a page abruptly stopped and a line of dialogue landed in the gap. A section began in the middle of an action rather than at its start. These are copyable moves, which is the whole reason for the exercise, and they are almost never the moves you would have guessed while under the spell.
Writing the note in your own words
Do not transcribe the passage and leave it at that. Write one sentence describing the move in general terms, phrased so that it could apply to something you are working on. Not what happened in the book, but the mechanism: withhold the subject of the paragraph until the last clause; cut the description at its peak rather than at its natural end; let a short line follow a long one to make the short line sound like a verdict.
Notes in that form accumulate into something usable. Notes that stay attached to the original scene remain admiration, and admiration does not transfer to your own drafts.
Reading badly on purpose
There is a companion exercise that is less pleasant and unusually instructive. Take something you found tedious and find the exact sentence at which the tedium began. It is nearly always locatable, and nearly always structural: an explanation arriving before you had any reason to want it, a scene continuing after its business was done, a sequence of paragraphs at identical length and pitch.
Locating that sentence teaches you more than three admired passages, because it is the failure mode you are most likely to reproduce. Nobody accidentally writes an extraordinary paragraph. Everybody accidentally writes a paragraph that has stopped doing anything and has not yet noticed.
How much of this to do
Not to everything. Most reading should be only the first pass, because a writer who has stopped reading for pleasure quickly runs out of the thing the pleasure was feeding. Two or three books a year given the second pass is a heavy diet. The marks, if you keep making them, cost nothing and remain available whenever you want to go back.