I've watched W&I over a hundred times, and fully intend to go on doing so until I can no longer press the "play" button on whatever device we're watching films on in the future.
I've noticed that if I watch it many times in a row without much lag time in between, I stop experiencing it properly... I start saying the lines along with the characters, then backing it up and playing the line again to make sure I got the accent right. I start pausing it and staring into the background, trying to see what that picture is on the wall behind someone in a room. I become unable to actually watch the film as a story unfolding - it becomes more like an amusement park for my brain.
Every once in a while I have to force myself to stop and take a break, let some time go by, so that when I watch it again I get the full experience of seeing it as a story, instead of picking out each detail.
Is it that way for anyone else?
... followed by yet another anecdote about his sensitive crimes in a punt with a chap called Norman, who had red hair and a book of poetry stained with the butter drips from crumpets.