Concentration meditation is an extraordinarily powerful method. Ordinarily, the mind wanders haphazardly from topic to topic even in the middle of tasks [1]. Most people find it a challenge to focus on even one thing fully for 30 seconds without their mind wandering. With good concentration practice, the mind concentrates fully and effortlessly for as long as the meditator wants. As you can imagine, that can be a real boon for productivity.
[1] http://www.danielgilbert.com/KILLINGSWORTH%20&%20GILBERT%20(...