As a business attorney for over 10 years, I have seen my fair share of useless, unenforceable nondisclosure agreements and confidentiality agreements. Generally this seems to occur when individuals select some form out of a book, or now off the internet, and rely on it as if one size fits all. Well it doesn't for a multitude of reasons.
Separately, if the person receiving confidential information discloses it, either deliberately or unconsciously, what are you going to do? You won't be able to patent disclosed ideas.
The illusory world of trade secret protection