The megacities of China are full of these overpasses, but not the older sections. Beijing is riddled with them, but to cross the newer quasi-expressways. Shenzhen has them everywhere, but it is a city that was largely built since 1980 from a small fishing centre to a hypercity built with the car in mind. Hong Kong has these, but not on say Nathan Road or outside the financial district on the Island. There's no overpass at Argyle and Nathan, and that's twice as busy as Spadina and Dundas.
Other cities do have underground complexes near the railway stations (Dalian, Changchun), but that's pretty much the only time pedestrians are forced off the surface in second and third tier Chinese cities.
The busiest intersection in the city for pedestrians is Yonge and Dundas, followed closely by intersections in the financial district, particularly towards Union Station. And that's despite the PATH. Spadina and Dundas does come in the top 20, but if you do a rate of injury per pedestrians crossing, it ranks pretty low in risk.