OP is a nursing mom. When she returned to work, she had her own office and would simply “shut the door” when she needed time to herself so she could pump discreetly.
OP says at first, everything was fine. She'd shut the door and do her pumping. Then, people would start stopping by, knocking, jiggling the door handle, and even making requests through her closed door.
She says that it has dramatically reduced the number of disruptions she gets but that it has also come with complaints from a couple of coworkers who've said it's “too much information” and makes them uncomfortable.