http://googlesystem.blogspot.com/2007/07/pressure-of-google-nda.html

What is a generally reputed to be a paradise-like work atmosphere does have one problem that frustrates the hell out of Google employees.......read on to find out what that is

I wouldn't consider this a dark side to working at Google. It's what many people have to deal with because of their industry. Try asking an employee at Apple what they do and you would probably get the same type of reaction.