I believe I read that there is a Global Entry type card US Citizens can get at Airports in Germany that is like a quick pass thru customs. Does anyone know the story on that?
There is. It's the EasyPASS system, which allows you to use eGates at immigration at German airports. It's available through a special bilateral agreement between the US and Germany. These are the gates normally for EU/EEA/CH citizens, but there's an extra step for EasyPASS travelers to see an officer and get a passport stamp
All the details are on the linked page and their FAQ. The service is free, but you have to complete an application form and visit an enrollment center run by the German Federal Police (outside the secure area of the airport, which I've never managed to find the time to do). It only works in Germany, so it's only useful if your first point of entry to the Schengen area is Germany, not if you're going through immigration in another country and transiting to Germany.