Anyone who approaches a camoflaged photographer is not all that bright.
My experience is that most people are actually pretty considerate. Even most kids are not that intrusive. Bird watchers as a whole tend to be very considerate of the birds themselves and especially nests. I limit my nest photography to ones clearly on a public path. I don't make my living that way and I feel that if there is any chance that I am disrupting bird nesting that it is just not worth it. Just my opinion about me, no one else.
Osprey are in no way endangered and nest in very public areas. I know of one nest on top of the lights at my kid's High School Football stadium. I think they will come back.Plus though they are nest building right now I don't think they have layed eggs yet.
Many photographers/film makers have done some pretty bad things to get a photo in the past also. Jacques Cousteau was particularly guilty in this regard for his "Undersea Life" stuff.
Our photography does not enrich the bird's life at all and we are priviledged to photograph them. Just so we don't harm them in the process.