I'm not too worried about this.

It's not like they really are microwave ovens. Electromagnetic wave communications technologies don't need to be powerful only detectable. If 5G really does use less power then that's even lower energy radiation anyway. Ever increasing efficiencies of detection technologies drive down how bright antennas must shine, and the less juice it takes to fling your message the less each byte costs. Also, the closer antennas are together the dimmer they can be to communicate as per the inverse square law, all other things being equal.

It's not like it's ionizing radiation. We're all currently bathed in quite dim microwaves from just the background radiation, and every living thing ever has been too.