Welcome! It's going to be hard to translate other members' experiences with giving up throttles into decision-worthy info. Too many uncontrolled variables — including terrain, fitness level, bike weight and motor, assist type, and the kind of help the rider actually wants from a throttle. Many valuable uses for a throttle beyond getting a break from pedaling.
But you don't have to rely on others. Just stop using your existing throttle on some representive test rides in your own terrain and see where that leaves you. Can you get by without the pedaling breaks just by bumping assist or downshifting?
Then factor in any differences in the new bike's weight, motor specs, gearing, and assist type, and see if it still makes sense for you with no throttle.
Most importantly, arrange some test rides — if not on the bikes you're eyeing, then on bikes with comparable specs. That's the only way to know for sure. Personally, I'd never buy an ebike I hadn't ridden first.
At 77, I successfully went from a heavy torque-sensing hub-drive commuter with throttle to a mid-drive fitness ebike with half the weight, power, and torque and no throttle. Really needed the throttle on the commuter for knee-related reasons different from yours, so our experiences aren't really comparable. But after some easy adjustments to riding technique, I get by just fine without a throttle on the fitness bike.
Good luck.