The debate is never "I have nothing to hide" vs "you have some things to hide". It's about what power the government has to spy on you, in order to protect you. A lot of people think something like this: if the government needs to look through people's stuff in order to catch terrorists, well, I myself am not a terrorist, I'm ok with that, as long as they keep me safe.
A lot of people are purists though. They say the Constitution states that the Government can spy on you only with a warrant granted by a judge based on probable cause (Fourth Amendment). There are edge cases though, and these cases were debated and will continue to be debated for as far in the future as we can foresee.
The idea that the debate is simply about "I have nothing to hide, so everyone can spy on me as they like" is a complete straw-man.