Using your subconscious mind can substantially increase your productivity and your multitasking abilities.
We have two minds, the Conscious and the Subconscious. The conscious mind acts within our awareness. It works under instructions and/or approval from ‘Self’. The subconscious mind acts in the background. We become aware of its activities, if at all, only after the activity has been executed, hence it is spontaneous and fast. Our 'Self' does not interfere with the actions of the subconscious mind. There is no self doubt, no dilly dallying, and no instruction or approval delay.
We use our conscious mind for activities that we are not used to. With practice and experience, the sub-conscious mind can take over most activities. For a new driver, stopping the car requires him to consciously step on the brake pedal, look into the rear-view mirror and steer the car to a side. An experienced driver can stop the car, without consciously stepping on the pedal. His subconscious mind would take care of all the necessary steps. Similarly, if a writer is experienced at typing, his conscious mind can concentrate on the article, while the subconscious mind can do the typing.
You can increase your productivity and multitasking abilities dramatically by letting your subconscious mind take care of more and more activities. In addition to practice, it would also require conscious efforts to develop the confidence of leaving things to your subconscious mind.