Anisotropic filtering is important at any resolution.At this resolution, anti aliasing is completely unnecessary, and AF doesn't help much.

Notice how textures in the distance are completely blurred without the use of AF. (left)
While I've heard people say that anti-aliasing is less important at higher resolutions, I'm not convinced. The lack of anti-aliasing in iPad games that run at native resolution, such as the initial Galaxy on Fire 2 HD update before they reduced it, was very noticeable to me, and that is a higher density screen than the new Retina MacBook Pro has.
Out of interest, is there anyone playing the new Civilization: Gods and Kings? I'm really enjoying that on my PC right now, but am curious about how well it runs. (note: the game will run very well at the start, but when you get above 300-400 turns, it will run considerably slower)
And for the people playing Diablo 3, I would suggest disabling anti-aliasing. Diablo uses post-processing FXAA rather than traditional multisampling AA, which is essentially a filter that tries to blur aliased edges. The game should look much sharper with it off, and probably run better too.