Actually it is - I don't like waiting for ages when I want to watch a move right now.
Sure, I'm on an awesome tracker, and I can download an HD movie to my seedbox within 5 minutes. No problem. Then I just stream it over my home connection (which is rather slow.) So there's a 5-10 minute delay, which I can live with. But, if somebody would offer me an insta-HD-streaming feature (Netflix doesn't count, I'm in Europe,) I'd pay for that.
But nobody does, so I torrent.
They intentionally bury it, though, because 'play now' is their premium offering (a shady business model imho). You have to go to the torrent's files, right click the .avi/.mkv/.mp4, go to 'Media server' -> 'Copy stream URI to clipboard', and then you can use that stream URI in any self-respecting player (VLC, mplayer).
That's terrible UX though :)
(Small note: in-order download is generally frowned upon in the torrent world, becaues it's bad for a torrent's health. However, Vuze manages this nicely by both prioritizing the pieces in order and still downloading/seeding random pieces at the same time. I think it's a very good compromise.)