I've been the same since I got my first music player. I checked out spotify becase a.) I wanted to check the new versions of the songs on Kanye West's The Life Of Pablo and b.) my music player was low on battery when I was about to leave home, so I figured I quickly download the app, add a few bands as favorites and see what it does with them.
I was pleasantly surprised when it immediately created random playlists for me based on my liked bands. I haven't tried the discovery part yet, but it may be useful too. If you don't want to be surprised, you can still create your own playlists, just like you select songs for your music player.
It's also cool how basically EVERYTHING is up there, in decent quality. Even obscure bands like Disarmonia Mundi.
It's also helpful during gaming, because I am just too lazy to make a playlist on my computer, not to mention that with all the Windows reinstalls, I keep forgetting to download certain records. An alternative is youtube, but its recommendations are absolute ass, and I don't want to listen to just one record. With spotify I can either favorite hundreds of tracks and play them on shuffle, or trust myself onto the Spotify generated playlist for me.
I think it's quite handy, but sadly, annoying on phone. Many adverts, and sometimes it doesn't let you skip songs. But 6 euros per month is a bit too much just to get around that, and I don't get any ads on the pc version, so I guess I'll stick with non-premium for now, unless there'll be a discount.
