Actually, there is nothing wrong with using ladders. Before ladders, media photogs used hard cases to stand on when they are late for an event and do not have a good spot to shoot. Its used to shoot over the heads of those in front. Its a good piece of equipment to have - a ladder or a hard case to clear the obstructions. Internationally, you'd see all kinds of stuff photogs use to stand on. Hard cases, ladders, chairs, cargo cases used to keep their equipment. When you got a job to do, just do it.
Of couse, refusing a wheelchair bound person is the other extreme. What's wrong with giving way to a disabled person??
So... don't make a mountain out of a molehill but do be considerate if you are only shooting leisurely....
Don't be a nuisance and kill the golden goose.... I hate to see photography earning a bad name in Spore....