I don’t have a throttle on my current e-bike, BUT when I did have one on my prior e-bike it turned out to be very useful in dealing with traffic and stoplights/stop signs to easily get up to speed smoothly and quickly.A throttle's just a riding tool. I find mine very handy in many situations having nothing to do with getting out of pedaling — usually just a second at a time. Otherwise, I ride at lowest possible assist like you.
But my throttle's implemented very differently than yours. Below 20 mph, mine's fully enabled at all non-zero PAS levels. It's also progressive. If it were only enabled at PAS 0, I wouldn't have much use for mine, either.
Based on what I read on EBR, throttles are implemented in a variety of ways. Makes it hard to extrapolate our throttle experiences to other bikes and riders.
I’d go as far to say that it improves safety and maneuverability, much more than you’d imagine. But really just talking about those that have to deal with commuting around cars and frequent stops.