And yet, I am endlessly fascinated by them. When I find a particularly gruesome subject my first instinct is to capture it in a jar, not squish it. I need to get as close as possible to really see the damn thing. To figure it out.
When writing (or making theatre at all) I think it's important to find your spider. What subject matter or idea scares the living shit out of you? Go there. Immerse yourself in the fear, in the revulsion. Force yourself to confront the unconfrontable. Pursue dark thoughts down dark alleys, and force them into the light of contemplation. Even if it doesn't cure you of the fear (I'm still scared of spiders!) you are bound to learn something. Learning and sharing what we've learned about our basic humanity is the point (I think) of storytelling.
If you're comfortable in the pursuit, you're doing it wrong.