The option is there you click on all the photos you want to share with some one and there you go it's shared they having access to your account give you no privacy. Not every photo I will want my mother to see neither my other half so that is where you have the option to share. You can hi-light all your pic and share them with your spouse if need be.
I'm still not seeing the ability to share all your Google Photos with other accounts. People actually exist in families, Google, and we want our spouses/family to be able to view ALL our photos. Organizing them into albums to share sounds like a pain in the neck. Just allow us to give access to other Google accounts.