I would really enjoy if I could see what I listened to one and two years ago, or longer. I've had Spotify for over 6 years so imagine how the music taste changes.
Sometimes it's so much fun finding an old song you used to love but haven't heard for so long. Maybe you could be able to access your old Starred playlist from a year or more ago etc. Possibilities are endless!
I've spent whole nights just looking for and playing nostalgic music, and imagine how good it would be for the artists.