It's similar to another example. I moved my mom over to use Linux as her operating system. I now know, for a fact, that her system is secure and updated. I trust the distribution to audit and package software safely, therefore my stress levels are much much lower and I barely get technical support questions from my mother, compared to before.
Smart contracts enable this same level of trust to develop for complex protocols between people & computers, like mortgages, insurance, DNS, software package building and distibution systems. It allows for advances levels of trust to develop in the system itself, and as an engineer I can now transmit that trust through my web of relationships which is how it reach and benefit non technical users. In a way, it allows for engineers to take more responsibility for the systems we live within, versus today where you have to pay me to give a shit and I try to take as little responsibility for the systems I support because I know they are fucked up and broken and I don't want to be the one on the hook when someone gets hurt by the system I and responsible for.