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When you get shocked by a Van de Graaff generator, you do get high voltage, as well as high currents. The missing ingredient is time. The shock takes a very small time, so the energy delivered by the shock is very small. Skin-effect also helps.

What you care about is how much charge is at that high voltage potential because current is charge/sec. Charge due to stray capacitance can be quite dangerous because if you don't know what you are doing, the amount of stray capacitance can be higher than you expect. I would be very careful doing anything with kilo-volts using a circuit, as opposed to a static charge device, such as Van de Graaff generator.

415 volts on a 30A breaker, like you might find in an undergraduate electrical engineering lab, is very lethal. I'd hazard a guess that's what the OP is talking about.

415 volts on a 5A breaker is equally lethal, and not high-current.

1,000 Amps and 5 volts is dangerous (sort of), but not in an electrocution sense.