As the first thing to mention at least, I absolutely love the pacing and its part in the creation of the atmosphere.
I actually wish I understood how he does this, he sets an atmosphere and it remains throughout. And not only that but he does it with almost no drama or labor. Other Authors will describe in detail what they want you to see and think and then tell you again and again to make sure you got it. McCarthy does none of that but he still manages to create a strong atmosphere.
Perhaps that's his secret, he gives you just enough and trusts you to fill in the blanks.