I'm half and half. I have a PS3, so I do get Blu-Ray movies, although some are just not worth it. Just because you can see every flaw on Ricky Gervais' face in The Invention of Lying, BR doesn't make it a better movie than the poo it was. Now something like Star Trek (The 09 one), that was a BR catch.
To be honest, yes, I get my BR movies on how special effects driven it is. There is no other reason to have a drama movie look shinier if you are going to spend more time going "Yay, that persons face looks better" than what is going on in the movie. Hence why I shall get Sucker Punch on BR when it comes out in New Zealand, and Inception on DVD when I can be arsed buying the movie...