Just a brief comparison:
Seattle: population, 3,733,580; city density, 3,242/square km; metro density, 647/square km
San Francisco: population, 4,679,166; city density, 7,170/square km; metro density, 730/square km
Los Angeles: population, 13,131,431; city density, 3,275/square km; metro density, 212/square km;
Toronto: population, 5,928,040; city density, 4,149/square km; metro density, 849/square km
Montreal: population, 4,098,927; city density, 2,719/square km; metro density, 890/square km
Houston: population, 6,313,158; city density, 1,414/square km; metro density, 630/square km
Chicago: population, 9,472,676; city density, 4,600/square km; metro density, 509/square km
Boston: population, 4,628,910; city density, 5,368/square km; metro density, 396/square km
New York City: population, 20,153,634; city density, 10,890/square km; metro density, 688/square km
Vancouver: population, 2,463,431; city density, 5,493/square km; metro density, 855/square km
That's right, we've got density greater or near equal to Chicago, Houston, and Boston, any other city in Canada and any city in the West Coast... despite having a fraction of their populations. Only NYC is more crowded. And the powers that be are still calling for more.
By all means, let's welcome more supply, BUT we need to look at the demand side of the equation too.