Take some time, at least once a year, to sit down with yourself and have a vision for your life not based on work or status (ie vacations or the acquisition of things). If that isn't enough to snap you out, go to a small village in Latin America or maybe like Matthew McConaughey discovered and talked about in his book, a quaint monastery in New Mexico. Stay there until it makes sense.
Most people want to be productive because they want to feel valued by others. But if you have to look to your own value from others, you've already lost, and will continue to lose forever.
Be. You. Slowly. and you'll find you're more valuable than you ever thought.