Honestly, what you're dealing with is exactly what I was hoping to avoid when I did the wiring. And I have to say, it wasn't that big of a pain ~ I complain a lot, probably more than I should. But the big thing is that it's DONE. I've yet to hook up a few items, but its nice to know that I shouldn't have any problems with ANYTHING that I've done. I think the best part of doing it with the aftermarket harness is that you've been there, and done that. So if there is a problem, its not like I'm digging into an unknown hole ~ hoping to find a loose wire or bad connection. Everything is fresh, each wire is labeled every 2 feet, so if I'm looking for the right front turn signal, I can find that wire and easily trace it. The stock stuff has numbers, without a book in hand, your guessing.
The hardest thing was figuring out what did what on the steering column. Meaning, taking the volt-meter and checking what wires turned on when you clicked the turn-signal, brights, and wiper switches. As noted in the build, I got some labels and took a few hours just checking each thing and then labeling the wires coming out of the column till they were all labeled. There were a few that confused me, but in all, once labeled, hook-up was easy.
Would I do it again, ya. In fact, I'm planning too. I bought my son a 1980 Scirocco that we are going to take all the way down and build all the way back up for when he gets his license. However, I would do TWO things differently.
FIRST, I would have hid the harness in the inner fender like some guys do to make a cleaner bay making sure I didn't 'forget' any wiring like I did on the Jetta (as you saw, I added stuff that I could have worked into the original loom).
Second, I would use a Painless Wiring's harness instead of the EZ harness. The painless ones are more expensive and I've used them in the past. They are MUCH BETTER. The EZ harness was cheap ~ like $200 cheap, but the way they hook up the brakes likes, brake switch and other things wasn't very 'intuitive' ~ the instructions SUCKED on the EZ harness, and I found that I had to call tech support for any question because the provided instructions didn't explain anything. Painless has more wires, better instructions and many more connectors and provided parts to help with installation. I don't think I ever needed to call Painless when installing one of their harnesses. Had I not done several Painless harnesses in the past, the EZ-wiring harness would have been a nightmare to install.