It might be that discovery via Spotify is polarising based on genre? Some people seem to hate it but like you, I find it very useful and constantly come across new tracks/artists I really like. Never had anywhere near that much success in the past sourcing new music, and certainly nowhere near as easily. Sometimes with a custom Discover Weekly playlist, I will favourite 80% of songs it pitches to me.

And I also agree on the efficiency. My first music purchase was a record, then tapes, then CDs and so on. Getting recommendations right where I listen to the music makes it trivial to add to my list - usually via the desktop app while working or via CarPlay while driving.