i dont really bounce on my toes that often, only when i'm waiting on someone so we can leave (any situation).
i do bounce my leg on my toes when i sit though, as a way of getting rid of energy, simular to hand-flapping, but less visible, and it allows me to still sue my hands for typing...
also, if i'm stressed and/or tired, i will simply walk on my toes, but i count that as different, since it's not bouncing, but a full walk