This office always seems to have a line, which would be a problem in the age before the Automated mail robot that weighs and stamps out postage. That machine never seems to have a line, which is odd to me because 95% of my postal concerns work with the APC to ship out boxes and such right next to it in the big pull-down bin.
So... if you're in need of a passport, and must stand in line, then yeah, there's a wait. If you're just doing in-out drops, way easy and fine.