Northern Light
Superstar
Those areas are mid-density only in my perspective.
I'm not certain why we should substitute perspective for facts.
Below is a density map centered on Don Mills Road from the 401 to Finch. Note, that this is way back in 2006, when the area was not nearly as dense as it is today. I will find a more current image for the area when I get a moment.
From: http://www.torontotransitblog.com/430185149/4846960/posting/
The density in the immediate vicinity of Don Mills Station (within 1km) is over 10,000 per km2, which is the highest classification level the City uses for density.
From this Map, we can see that darker reds represent the highest densities..........
Have a look at this corridor:
From: https://www.arcgis.com/apps/webappviewer/index.html?id=1535b9fca54f46b3954bca6aaf3ab3f5
Note that densities are only set to rise (and significantly so) based on developments already proposed/approved/under construction.
Be assured even more are coming after that (and yes, I know)