When we get too old to ride our regular bikes, we probably will get E-bikes of some kind. Ain't there yet, though, and probably won't for some time. I like my (cheap, lightweight) mountain bike.
We (wife and I) both love to ride, we bring our bikes almost everywhere we camp. Right now, we need the exercise a regular bike gives. I'd be afraid if we had E-bikes, we wouldn't get as much exercise riding. Temptation would be to get lazy and let the motor do a lot of the work.
Still, really good info here, and lots of cool bikes out there. :)