Just jumping in here...I've been following the back and forth between you and (mostly) GM and hoping he would post some other scriptures.
As to the idea of death being (in a spiritual sense) something that doesn't necessarily entail lack of consciousness, we have at least a couple of examples that come to my mind. The first one seems the most prominent one (and if I missed it, apologies for the repost) :
And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried;
And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame.
But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented.
Luke 16:22-25
Jesus seems to be teaching here a very real place of torment that is almost unthinkable for its terror. But should we be surprised that the wrath of God is such an awful thing? It should, therefore, be no surprise that Jesus advised this :
Wherefore if thy hand or thy foot offend thee, cut them off, and cast them from thee: it is better for thee to enter into life halt or maimed, rather than having two hands or two feet to be cast into everlasting fire.
And if thine eye offend thee, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two eyes to be cast into hell fire.
Matthew 18:8-9
Now, if dismemberment and what we would call torture are to be preferred to being cast into hell fire, then what does that say about the fire? Surely it denies annihilation. After all, if someone is hacked to bits here on earth, their extinction is a mercy in comparison to what they had to endure. More to the point, is the one who survives dismemberment in a better state than the one who doesn't? Certainly not categorically - but Jesus makes no bones about it.
And then we have this scripture in the OT that speaks to the spiritual nature of the fire :
The sinners in Zion are afraid; fearfulness hath surprised the hypocrites. Who among us shall dwell with the devouring fire? who among us shall dwell with everlasting burnings?
Isaiah 33:14
First of all, it should be noted that this is clearly a spiritual condition. A spiritual fire (though no less real). I would think that would be apparent on its face.
Now, if the fire were to simply be consuming in the way we want to think of it (immediately devouring and annihilating everything it touches) then why would this scripture speak of these hypocrites dwelling in everlasting burnings?
Finally, to underscore the fact that someone can be dead (yet alive), consider this :
Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core.
These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots;
Raging waves of the sea, foaming out their own shame; wandering stars, to whom is reserved the blackness of darkness for ever.
Jude 11-13
Ignoring for the moment the fact that they are not reserved to fire but dense darkness (eternally), note that they are twice dead - yet they live. And further, their fate is not annihilation but being swallowed up by darkness. They exist but they are put away somewhere devoid of any light.
Now, I suppose one could focus on the darkness vs. the fire, but note that in all the above instances, it is clear that while the fire rages and men are in it, the total destruction of awareness does not accompany said punishment.
It may not be nice, but it has to be reckoned with.