You know, SayItAibnJoe and you Armita, have a point: Rewatching makes a drama/ book threadbare and strips it of its magic because we know what happens. And then I start paying attention to all the backstage things, gags, reels- now THAT really kills the maic of the drama; that;s why I make it my buisness not to be interested in actors' private lives or in what went behind the scenes, as this kill the magic even more.
But...if you lewave a drama/book for , say, two years you will probably no longer remeber irt. I do it like thos,. I have a period when I'm on, say, drama attack and then all cliches and expectations come back to me so when I see something fresher, it hits me. Once that fresh drama is watched, it becomes pulled into that pull of expectations. So watching dramas stops being exicting. The rush is down, I drop it, go get busy and in free time occupy myself with something others. Then, like a cycle, I want to see or rewatch a drama again, just because of the way it made me feel whle watching it. Only then I discover something fresher. It's a never ending cycle.