Yes. Humans only need about a quarter of the elements that we have here on Earth to live. But we have been very good at exploiting what we find around us. You could argue that many other elements are essential for us to live the way that we do in the modern world. Neither gallium nor germanium are essential for life but they are widely used around the world. Gallium compounds are major constituents of different semiconductors. Germanium is widely used in fiber-optics and infrared optics.