I have a friend who does this, and it always causes me to become overstimulated whenever I'm in the room at the same time, because it's just a lot of stimuli. So, I wonder if the desire to do this is due to sensory issues, specifically of the hyposensitive variety, which seems pretty common among ADHD folks. (I'm hypersensitive instead.)

On the other hand, I often find that if an activity doesn't take up enough of my attention (or whatever), I'll end up daydreaming which will gradually result in my paying inadequate attention to the intended activity. So I may have to multitask to function, e.g. listen to music while driving, draw a picture during lectures at school, etc. Maybe sensitivity level just affects the choice of activities.