Great product idea, and the interface looks really quite lovely. But why use only Google Drive as a storage layer?
If I want to schedule "prostate exam" or "take daughter to planned parenthood" or "goto Victorias secret for wife's gift" or 'AA meeting' or whatever, why do I want Google to necessarily know about it?
Not a full solution, but Moo.do stores documents on its' servers now, optionally encrypted with a password (so they are not able to read anything).
To exclude unencrypted storage in Google uncheck "Google Drive" in Plugins, and uncheck "Enable Backup Drive" in Backups.