But claiming that the second part of this passage is a metaphor makes no sense. The speech deliberately moves from clear metaphor - the parable of the talents - and then changes to being quite clearly NOT metaphorical (ie it is explaining the metaphor that came before it) - "When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory. And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth [his] sheep from the goats: And he shall set the sheep on his right hand, but the goats on the left. Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world"
This is clear from the text as being the words of Jesus himself, explaining what the parables is about.
Thus the line "Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels" is part of the non-metaphorical stuff. And the idea that the fire refers to some rubbish tip outside Jerusalem makes no sense when it is described as prepared "for the devil and his angels"
Seems to me you see the ultimate point of Christianity as a better life on earth - so how do you explain 'life eternal' then? Do we all live eternally on earth? It's going to get awfully crowded isn't it? And do we get older or stay the same age as we were when we died? And if so, it's a bugger living to 100 isn't it? We should all top ourselves at 25!
I honestly can see absolutely no evidence from this passage that it is about 'living with our conscience for all eternity' - nothing whatsoever. I suspect that much of the Bible is simply unpalatable for modern tastes (too bloodthirsty/sexist/vengeful etc) so what you do like - 'love thy neighbour' is seen as straightforward and the words of Jesus and the rather less attractive 'Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels' is dismissed as 'metaphor'. Which seems a suspiciously easy way out to me.
Yes, Jesus did suggest some thorougly decent moral points. But he's hardly the only person in history to do so, and we don't worship everyone who wants others to do good, do we? Or assume they are therefore divine?