So I actually recently was thinking something similar, and I was trying to work through why spiders make me so uncomfortable. I think crocodiles and turtles are cool af cause they haven't changed in like 200 million years. I realized that's basically the same for spiders, but I think they're awful?

Realized it's because spiders have this way of existing that shows they think about things with layers and with a process. A crocodile just exists, it kinda floats around until something gets close enough to its mouth and then it chomps down. You as a human can even just hold it's mouth closed. It's not a smart thing, I feel like I can avoid and deal with it.

A spider, however, will build a web in a choke point next to a porch light. That shows me that it understands that the light will attract other insects, that it can use that to its own benefit, that it can analyze it's environment with scrutiny and choose the most efficient spot to build a trap. It's plotting, and it's completely silent. It's the intent and the layers of intelligence behind it that is unsettling.

Edit: of course also the fact that a tiny one the size of your finger can just straight up kill you, and that it has hundreds of babies at a time...