I'm a heavy Amazon user: Prime member with a Kindle, an Echo at the main house, and an Echo Dot at the mountain house. It's not for everyone, but I feel I get a lot of value out of my Prime membership. Here are the Prime benefits that I use:
1. Free (or call it prepaid) two-day shipping. Amazon delivers to me 2-3 times per month. I don't like to shop, so when I need something it's just as easy for me to order from Amazon and have it show up on the doorstep two days later. Both DD's get free Prime shipping by being attached to my account. (I think this benefit went away a year or two ago, but they seem to be grandfathered in somehow). I use Prime to ship gifts to the girls and others. I probably pay for the Prime membership just with shipping costs.
2. Video streaming. I use it occasionally, and my daughters occasionally view using my login ID.
3. Kindle Owner's Lending Library. I can borrow one book per month from Amazon.
4. "Kindle First". At the beginning of each month, I choose one of six books for free. It's mine to keep.
5. Amazon Drive / Prime Photos. 5 GB of cloud storage for files with unlimited photo storage. I have the app set to automatically back up photos from my phone, iPad, and desktop. I'm currently using 3.6 GB of file storage and 19 GB of photo storage.
6. Prime Music. Up until recently, I rotated between free versions of Pandora / Spotify / Prime. But I am nearing the end of my 30-day free trial of Amazon Unlimited Music, and I'm probably going to continue the subscription. It's nice to be able to select specific songs, artists, albums, or genres. I can skip as many songs as I want. And no ads! The service integrates seamlessly with the Echo. There's a very inexpensive monthly subscription at $3.99 that's good only on one Echo, but since I have multiple Echoes and stream music from my phone I will likely opt for the $80/year subscription for Prime Members on multiple devices. If I wasn't a Prime member, the Unlimited Music subscription would be $10/month. So there's $40 saved.