I think laziness and workaholism are two sides of the same coin. Both are equally dangerous.
Slothfulness is a lifestyle of perpetual leisure and rest. Those who engage in it don't have time for work because they are too busy taking life easy.
Workaholics are compulsive in accomplishing tasks. Their days are spent 'doing' something, anything; they avoid rest and sabbath being perpetually busy with work. They steer clear of rest for one of two reasons: 1. They fear that others will perceive them as slothful or 2. They fear solitude, contemplation, and the voice within.
I think the biblical model is somewhere in between workaholism and sloth. It's a rhythm of engagement and disengagement; it's a movement between work, play and rest that results in productivity and efficiency when working and, conversely, peace and joy when resting and playing.
Want to know if you've got the balance right? If you spend your days off thinking about work or your working days thinking about time off, you likely need some adjustments.