This is me usually. As someone who has almost 370,000 tracks to choose from, I make my own playlists!
That said, the few times I've been at a friend's place where she was using Pandora or Spotify, when it deviated from the "seed" (artist or specific song) I actually learned of a few more artists to check out! In fact, the five I've been listening to lately have all come that way. So, there IS a benefit occasionally! ?