In Spotify I have my entire library in the cloud, accessible from my phone, home computer, office, etc. I get weekly (great) recommendations based on what I actually listen to. I can browse related artists, share songs with my friends, stream the music to all my home speakers in sync. Of course an mp3 player use less power, it only does a fraction of what Spotify does. It's not even like comparing apples and oranges, it's like comparing your bike to a jet fighter.

And, yeah, I grew up with Winamp and MP3s (or even .MOD/.XM). But the world moves on.