My son worked on a few transmission lines a few years ago. On one job, they were putting in another transmission line about 100 yards from the first transmission line. Even though it wasn't "live", a bad ground on one of the poles meant getting bit. He's now on the generation side of things, where it's a lot safer for him.
On a dry, breezy day an ungrounded run of moderate size (parakeet ACSR) can measure in excess of 50k volts! There is quite a bit of capacitance too, sort of like a linear Leyden jar. If it shocks you, it will be quite painful and can knock you out!
As far as living in close proximity, the physiological effect is nil but electronics and unbalanced audio systems may be susceptible to lower signal to noise ratio.
CRTs are a thing of the past but when TVs and computer monitors used them transmission lines > 230kV could cause picture shimmy due to the AC fields.
You could bury coils beneath them and "capture" energy via the transformer effect to supplement the power needs of your homestead. I would not recommend this as it's questionable both legally and morally.
Higher power lines enable you to hold 8' T12 FL lamps in the air and be the next Star Wars kid...