Is the danger of 230V actually significant in this day and age? I wonder how many fires/injuries are caused by 230V that wouldn't happen at a low voltage.
Also, it's not the voltage that kills you, it's the amperage. With regards to the 12V discussion, there's also AC vs DC to consider; AC will flip voltage 60x a second, making your heart go haywire, whereas DC is a continuous jolt, meaning your heart and other muscles will freeze in place until the power is released again, like how a defibrillator works.
A bit off-topic but I never liked that saying, it is kind-of-right but also soo wrong in so many levels. Amperage is not a thing that happens on its own, it is always a result of voltage, voltage is the driving force, so it is the voltage that actively kills you, by forcing amperage through your internals. When the killing happens the voltage is the real murderer, the amperage is just the murder weapon.