Recognizing that experience isn't really solid or permanent is the medicine for taking things too seriously.
Sensitivity to suffering (especially others' suffering) is the medicine for passivity and meaninglessness.
But emptiness is poison if it leads you to ignoring suffering, and suffering is unhelpful if it overwhelms. Falling into one of these ruts is not so good. But if you're lurching back and forth from one rut to the other, you spend at least some time on the road. The middle way is possible. We each have the ability to recognize the nature of experience and to ease the pain of living for ourselves and others.