So you think that a GST rate of, say, 50% would not put a damper on economic activity? Baloney! The problem is in dealing with relatively small changes spread across a large population: Liberals prefer to target their programs at a very few friends, so that the appearance is magnified. But the inefficiencies of such a system are terrible economically and provide all sorts of disincentives to economic activity on their own.
The fact is that the GST cut did have an impact, and continues to have a positive effect.
As for the question of government surpluses or government deficits: I prefer to have my own money in my own pocket for as long as possible. I don't want the government to take 30 years to pay for what it does today, but neither do I want to pay this year for what they will do two years from now.