Nice exercise in absurdism. Taking the case of "nuclear launch codes" and stretching it to "a shit-ton of classified documents" is exactly the kind of thing that causes problems. No-one is talking about handing out employee ID codes, or disclosing how government buildings are laid out. We are talking about things like secret prisons, military pollution (such as my own groundwater being contaminated by the Ai Force dumping degreaser on the ground at a local airfield for 30 years), testing of chemical/biological warfare agents on US military personnel (and CIVILIANS we now find out, with a french town receiving LSD spiked bread some decades ago).
What is at stake here is secret governmental policies intruding upon the freedoms of citizens.
In fact, come to think of it, yes, ALL of that data that you are talking about should be revealed. This includes passwords and nuclear launch codes. They can easily change the codes and passwords (and security patrol schedules) prior to their release. If that is the cost of making sure that innocent people aren't being raped and tortured by our government in some third world hell-hole, then that is a small price to pay.