Finally, as I took time to write more on this, there is also a important reason to rewatch.It's for creative people…
As a former cinema's student, you're right. I had to rewatch movies 10 times, sometimes more, just to catch this particular techniques. But when you gain experience, you don't have to rewatch, or maybe just once, you just have the abilities to catch everything at once.
So, i never rewatch....