And you can buy folding eBikes. The catch is that they're a lot heavier, and that same aging demographic is going to have trouble carrying a 50+ pound folded bike onto a bus or lifting it up to put into a car trunk. The ones with removable batteries can mitigate that problem some, I suppose.
Glad to hear you enjoyed your trip.
I have a ProdecoTech
folding electric bike. I've been using it to section-day-hike the Florida Trail. Park my car at one trailhead, ebike to another trailhead, then hike back to my car. In the time and effort to go 6-8 miles with a regular bike I can go 18-20 miles with an ebike and still have energy to hike. As an added bonus the frame manufacture and final assembly are in the USA, in my home state of Florida in fact. Parts, of course, are sourced globally. As you say, it is heavy to lift in and out of the car. I usually remove the battery for recharging in the motel and leave the bike in my car.
I've been really happy with mine.