Wow, that is a mess of wires. I think in that one shot you are holding the delay wiper module. Somebody correct me if I am wrong, but on 78-79 the delay module was mounted under the center console, and on 80-82 they were mounted behind the passenger seat in the rear cubby. The 78-79 style is no longer available, so becareful with that puppy.
I am pretty sure those other wires that go to nowhere are simply for other options you car may not have like rear window defog, etc. It is cheaper for the factory to make one harness and stub it out than to custom build each one.
Speaking of ricers. We have a rice tuner right around the corner from where I live. I saw one of his recent project hondas at the autopart store. Let me simply say that the intercooler on this early 90's Civic ran the entire span of the front bumper and the was as tall as the bottom edge of the top of the bumper cover to the lower air dam area with and inlet and outles at least 4" in diameter. His stuff is fast. However, I bet that entire turbo set up cost more than a pair of schweeeet aluminum heads, roller cam, and matching intake/carb and must require constant tweaking to keep the boost from destroying the gerbils trapped under the moster plug wires and chrome covers.