I usually have to listen to a song several times before it fully "clicks" if I like it or not, so music streaming subscription is great for being able to grab any song I think I might like and throw it in trial playlist. Back when I bought/acquired music, I would skip over most music I might like because the effort wasn't worth it for a song I wasn't sure if I liked or not. So streaming has worked really well for me for music discovery at least.

On the bright side, I'm still getting my $8 a month early adopter price for Google music all access (now YouTube music).