Yeah I used to order a lot of stuff off Amazon, just random stuff. I've kind of adopted a more minimalist lifestyle and also downsized to a smaller hosue so really have to justify all my purchases and items I own so I've since stopped ordering as much stuff. Its probably a close call whether I get the value on the 2 day shipping.
If you take advantage of their music and movies then I think its definitely worth it. Considering spotify or a music service will cost you $7 to $10 per month and netflix or hulu will cost you around the same if you use both those things I think its probably worth the money. For me I watch way more netflix than I do amazon and i listen to pandora instead of amazon music so for me its probably not worth it