Web design and the Retina Display

[pelsar]

I've been reading and reading and still dont get the answers:
the Retina display has 2x the pixels, which means as i understand it, if i'm designing a website thats good for the MBP and its retina display i have to make the site 2x as large as i normally do

of course on the non retina screens, which is most of the world thats absurd.

so am I designing 2 websites? one for the retina display and the second for the rest of the world?

and since its a responsive website, of those two sites which one go to the iPad and iPhone?