Strangely enough I see more cyclists on the sidewalk than on the streets where I live. It doesn't matter if they're on a clunker like me or a spiffy new bike. It's not unusual then for me to share the sidewalk with exercise walkers, bikers and even people on mobility scooters.
I live in a suburb in Florida where the sidewalks are not crowded with pedesterians with good reason. It is freakin hot here. On a bike, going a short distance, it is tolerable - until you get caught in a sudden shower. Then you're hot and soaking wet.