We talked about this before in the politics thread. At the time the home insulation scheme employed a shitload of people, the **** kicking dole bludging type of people (many of whom I knew at the time) who if hey weren't employed by this, would have been straight to the dole queue getting paid to do nothing at all. The very fact that these people had extra cash to burn, and aren't the 'saving' type, meant that every dollar they were paid was instantly recycled into the service industries, stimulating the economy, and yielding GST for the state govs.
A side issue (but related) was the BER program. I work for a small-mid size engineering firm, and for a couple of years there a good portion (maybe 10%) of our work was for national buildplan. So that program was employing everyone from labourers, through to trades, to surveyors, engineers, architects directly, and as a result, they spent it on services, and didn't default on their ******* mortgages. The economy was stimulated.
I'm not trying to say that the stimulus measures saved the day, but they definitely made a marked difference, over many sectors, and QUICKLY.
The numbskulls who stapled foil sheets to live 240v cables, well that's Darwinism in action isn't it. People die every day for doing stupid **** and we don't blame the government.