yep, but citizen's services have declined over the years. Used to, I could walk into the main consul and see someone. Now, I have to go to the appropriate office after making an appointment perhaps weeks ahead.
To be sure, much of the reason we have consul services in other countries is not just for benefit of visiting U.S. citizens. We also pay fees when we use such services. Consuls/Embassies exist for business development and foreign policy management as well. A U.S. citizen that has never left the U.S. benefits from those services indirectly.