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A retina display's claim that individual pixels are small to see means you're not supposed to be able to distinguish individual pixels in an image - so curved lines appear smooth without pixelation.

It doesn't mean that a 1 pixel-wide line is invisible, or that you won't see a single white pixel on a dark background.

Most likely, 1px = 2 device pixels on the retina MBP, like on the the retina iPad and iPhone.

Surely that must have some sort of scaling by default for webpages. Otherwise I would guess nearly all websites appear miniature.

From what I have heard everything is up-scaled to match the native resolution so things that are not optimized for the new displays just looks kinda bad.

Images would be this way, but fonts, gradients, vectors, etc all look fine. (Unless the app itself hasn't been updated to render those in the new density. Safari works great)