Mississauga alone probably has a dozen "skylines". The "skylines" at Cooksville and Hurontario/Eglinton might be larger than the one at Port Credit. The one around Erin Mills Town Centre is still growing too. 300+ high rises, more high-rises capita than the City of Chicago, according to the SSP database. The entire Hurontario corridor from Lakeshore to Britannia could be considered one long "skyline", and there are many such corridors throughout the GTA, and Greater Vancouver is probably the same. After a certain point, it is hard to think of all these hundreds and thousands of high-rise buildings in terms of "skylines" anymore.
View of Mississauga's "skyline" in its infancy in 2004 at the very beginning of the condo boom:
Toronto is the king of suburban skylines? Look at this. Is this really a skyline anymore? Was it ever a skyline?
Skylines stand out from their surroundings, and these buildings never stood out that much to begin with, and they are only standing out even less and less as time goes on. Of course, that's not a bad thing, the GTA tries so hard to build transit corridors. But emphasizing corridors does mean less emphasis on nodes, and these corridors really are just an extension of Downtown Toronto, which is the only place that truly stands out. They have tried to rectify that in recent years with places like MCC and SCC. You can an earlier attempts like NYCC that is so linear, little more than a single corridor, not envisioned from the ground up to be a node, so it stands out very little from the rest of the Yonge corridor.