I highly recommend Suttree, which is much less in that post-apocalyptic vein. It’s incredibly humanistic and funny and I think it’s his best work. It still has his incredible command of the English language and sequences of just absolutely beautiful prose, and in some ways it can be quite devastating but it’s much more balanced with the endearing parts of humanity I think.
Suttree is an early work, and said to be heavily autobiographical. I read it as a key to understanding McCarthy's view of the world, being essentially tragic.
I'd suggest there's a similar identification between the author and the Kid of Blood Meridian.
What McCarthy thinks of Melville's Moby Dick I have not heard, but for the reader anyway, there's a rich cross-fertilization. Both of ideas -- being a pawn within a monstrous, doomed enterprise -- and of technique, as with the cryptic oracles of catastrophe who say their piece and then vanish from the narrative.