Has lost none of its ability to frighten.

That's what makes it a classic. You are still scared by it, especially the part where Miles is all alone on the highway trying to convince cars to stop and nobody listening to him. The music even helps.

Agreed

Creepy but the 1978 version scared me much more!

I agree. And it's also aged well and has not lost any of the impact it had when I saw it as a kid.
It reminds me somewhat of "The Haunting," another one that scared me out of my wits as a kid and which also had virtually none of what I consider cheap FX that movie makers today invest their money in instead of good writing of a good story and good acting.
I grew up in the 1950s, and although many look back now to the Eisenhower era with a fond sense of nostalgia, as I look back the "normalcy" of that era has a tinge of the creepiness of the Pod People -- knowing what I know now.

The whole premise of people being reduced to the level of bland and unfeeling automatons remains chilling because it still has resonance even today.

I've been chasing grace/ But grace ain't easy to find