I don't recall telling anyone. Why would I? It seems immensely private and I don't think my sons, who are now 5 and 7, would appreciate feeling like their penises had been the subject of anyone's conversation.
No one really changed my boys' diapers except for my mother, and she never commented. I did let her know not to bother them or retract them, but she wouldn't anyway, there's no reason to really mess with the penis while changing a diaper. I don't think my inlaws actually know this about my sons and certainly no one else does.
If it came up, like if other people brought it up, I just asked them what they did and was noncommittal. Smiling and nodding at their opinions and then saying, during the pregnancy, "we are researching it" or after the births "that's private." But really it almost never came up. My dh's aunt gave me a rant once on how dirty not circ'ing is, but again, she didn't know that was our choice and I just smiled at her and said, "is that your feeling? you think boys are less able to keep their bodies clean than girls?" (she said YES!) and I said, "hmm, interesting thought."
I have talked openly about it with very close friends who are pregnant, if it comes up. Just a brief, "we chose not to do that" and follow-up if asked "why." Only because I want others to understand that its a possibility to not circ and that they have friends who have made the choice. But I don't push, because I think that has an opposite affect on people and, again, because my sons' bodies are private.
When I read the topic "pressure to circ" I thought immediately, by who? Other than the baby's other parent, I can't imagine who would know or have a right to know, unless you asked for their opinion.