Sharing the secrets behind the parlor tricks can help with this feeling. Some particular technique may feel easy for you, but there could be people out there who haven't discovered it yet, and are stuck on some task.
Yeah, I think that's a big part of it. I remember being stuck on things for a long time, bashing around on google trying to find something, anything that would help me understand it, saying to myself that once I figure it out, I'll certainly do a huge writeup of exactly what I needed to know to ease my pain.
Once I'd figured it out however, it seemed trivial. I must be the world's biggest moron for being stuck on it so long. Real engineers would have it sorted in a few minutes. That's why there was no posting explaining it. I was just in over my head and it was my amateurishness showing. It should have been obvious.
If I write it up, it will just show my ignorance... so goes the pathology.