the TV/movies side is only a small part of it though isn't it.
free delivery on anything/everything, prime only sales/deals, prime music gives you thousands of albums to listen to including new releases & hundreds/thousands of books/magazines free to read as part of prime reading. twitch premium which if you're clever means you can give yourself a $5 subscription for free every month (just set up 2 channels and give yourself $5 every month for nothing) + other crap like unlimited photo storage.
For £6.58 per month it is an absolute bargain as far as i am concerned