my opinion is that there is enough demand for good programmers for the market to determine good wages/benefits. the usps union in question is working on a new contract. rumor has it they are agreeing to a whopping 3.5% raise spread over 5 years. the last annual raise was 1.2%!
there are a large percentage of "obsolete" CoBOL programmers that weren't transitioned properly to web applications. many of whom perform non-technical/light-duty tasks. the mostly younger folks carry the majority of the load. it's mostly a result of incompetent management whom never enforce accountability.
Managers have the same benefits. Plus, they get to telecommute 2-3 days a week! Since that benefit was given a year or so ago many of the managers have become even more disconnected with their job.
Managers also get bonuses which they deny. The bonuses are called "pay for performance". That's a joke because the metrics used for the PFP bonuses are ridiculous and encourage micromanaging which creates resentment towards supervisors. The entire workforce is demoralized. For most, it's difficult to leave the benefits.