Very little. I think the last time I was bowled over by graphics was 14 years ago, with Oblivion and Gears of War on Xbox 360.
Now, that's not to say I'm not interested in the forward march of technology, but I'm much more invested in what new gameplay possibilities technology offers, whether related to physics, AI, terrain deformation, etc. The nuts and bolts of a game are, to me, more important than its outward appearance.
I still love a beautiful, polished video game, but it doesn't excite me without the promise of great gameplay.