I think it very much depends on how annoying other ways of watching things are to you. The main benefit to netfix is on average higher quality more access to subtitles than stealing stuff via torrents, and FAR more convenience than DVDs, especially for those of us with new enough computers to not even have DVD trays.

With Spotify the main added benefits are being able to use your own music from a home computer wherever you go, and no advertisements. For me advertisements are pretty damn annoying, but your own mileage may vary.