To be fair, the 'correct' way to do this is to use a double-pole switch that actively pulls (whole-device) VCC to ground when off, but that has it's own problem

To be fair, the 'correct' way to do this is to use a double-pole switch that actively pulls (whole-device) VCC to ground when off, but that has it's own problems, especially if any of your sensors are capable of generating electricity on their own (piezoelectric microphone, radio reciever, alleged photo'transistor's that can operate photovoltaicly, etc).