I disagree. The Vancouver area is one of the most expensive in the world for detached house (median house price > 10 x median income), but that's not for lack of denser housing options. I don't know anyone under age 40 who has even considered buying a detached house here; the default option is to buy a condo in one of the many towers which are going up, and the expensive "yuppie" option is to get a townhouse.
Land is expensive because people want to live close to the city center; not due to excessive zoning restrictions.