Toronto has a lot of commercial strips that run continuously for long distances, following streetcar & subway lines. They kind of bleed into each other, with individual neighbourhoods often containing portions of multiple streets of significance. So, it's those streets that take on the identity moreso than the surrounding environs.
The exceptions that
do have strong neighbourhood identities - like Parkdale, Weston, or the Junction - are often places that were once their own towns and developed independently prior to being absorbed into the city; or are more residential in character (eg. Rosedale, Cabbagetown), or have more diffuse commercial side streets (eg. Kensington Market, Yorkville) and/or are clearly delineated by geography.
Vancouver's neighbourhoods are also largely focused around commercial streets (as most Canadian cities are), but these streets are less interconnected and function more independently from one another (more like a town's "main street" than continuous urban thoroughfares). Therefore, they're synonymous with the identity of the neighbourhoods. Vancouver's prominent neighbourhoods also tend to have clearer geographic delineations, given the city's topography. But then again, you also have neighbourhoods like Grandview-Woodland, which definitely takes a backseat to Commercial Drive on the name-recognition front, so who knows! To some extent, it might just be as simple as being a product of how catchy the name is.