I'm also about to beat my head against the wall. Thankfully, the wine should kick in soon.
Whoa! I had no idea this topic inspired such strong opinions!
Like you Bonobo, I have the same dilemma of whether or not to go to the courthouse before (or even after) our wedding ceremony in Mexico. I understand both sides. We would love to have the ceremony in Mexico be fully and totally legal because doing the paperwork beforehand does feel a little bit anti-climactic. On the flip side, the requirements for the legal ceremony in Mexico are a headache, and we might not be able to do them because of our timeframe for the wedding.
I know that none of our guests would be upset that we were legally married in the US before we came to Mexico. My fiancé and I, all of our families, and friends, view our wedding in Mexico as our real wedding. It also might be a regional thing too - we live in New York and most of our friends think you actually HAVE to get married legally before your destination wedding. It's become the custom to do that instead, and we're actually the only people I know of (in our general friend group) who are trying to do a legal Mexican ceremony.
Like other people have said, I think whatever suites you, your family, and your guests the best is the way you should go! I'm sure no matter what you decide to do, everyone will be happy to celebrate with you and you'll have an awesome day!