Eh, I'd still consider those cases to be spending what you have more or less. No, you don't have the whole sum at once in most cases, but if you're smart, you make sure your monthly car/home loan payments aren't going to be more money than you have for the given month.
However, when people aren't smart with their credit cards by doing things like not taking into account how much money they'll have at the end of the month to pay it off, and then they keep doing the same thing month after month, adding to their nice stack of debt, that's quite stupid.
Maybe a better way to rephrase what I was saying is "Don't spend what you won't have," or rather, know how to manage loans and not treat them like free money like so many people seem to do.
And actually, I find it funny that you act like it's impossible to get a house/car without a loan. It's very possible. The next car I'm planning on buying will actually most likely be almost completely paid for, if not completely paid for on the spot simply because I will have enough money sitting around to do so. If you have the money saved up, you can do these things without loans, it's just a matter of if you're willing and able to wait or not. Not to say that I'm against using loans, cause I definitely am not, I'm just stating that I probably won't need one for my next car puchase (probably will get one and just pay it off early though for the nice credit score boost it will provide).