You've obviously done your research, which is good - many people do not factor in all the associated costs with a home. The mortgage alone - as you alluded to, depending on the interest rate and such, a person could end up paying twice as much for their house over the span of the mortgage! People criticize renters for "throwing their money away" in rent, however what about home owners who pay property taxes and (in Canada) non-deductable interest on their mortgage? That money does not add to your investment at all, so it's essentially money you're throwing away as well.
Further to this, this is the big difference I discovered between the US and Canada - in the US your mortgage interest is tax deductible - in Canada it is not. To offset that I believe in the States you pay more tax when you sell your home though whereas in Canada if it is deemed your primary residency you pay no capital gains. Anyway, the interest thing is huge. As a result, my wife and I structured things such that we avoided "bad interest" (i.e. non-deductible) for our house and instead have "good interest" (i.e. deductible) which is going to save us tens of thousands of dollars over the long run, if not more.
This gets into a whole other discussion though on money management techniques, tax strategies, investing, etc. and although I have a passion for all things financial I won't bother putting that hat on right now in this thread lest I hijack it.