Must depend on what part of the country you live.
I have to go to the Post Office quite regularly and I have always found the people there helpful and the line moves pretty well.
Many times my carrier gets out of her vehicle in the rain (snow, sleet, gloom of night
) to put my large bundles on my porch when it would be so much easier for her to simply put one of those "pick up your big mail package at the post office" cards.