I agree with a lot of your argument about reducing taxes and spending, but I don't see any benefit to growth for the sake of growth. I would be happy with a sustainable economy and a high standard of living.
I totally agree. Growth for the sake of growth is, in a word, stupid. Or, in another word, self-destructive.
That said, the US economy, while vibrant and varied in many ways, would be stronger of several things happened. One of those things (and I'm way over-simplifying for brevity) is that since the requisite rate of growth is tied to the rate of inflation, and since the rate of inflation is tied to gov spending & borrowing & our fiat currency, we are forced to "grow for the sake of growth" at the moment. If, however, we switched from our weak "hallucinatory" (fiat) currency to a strong "backed" (commodity) currency, it would stop inflation in it's tracks. That, in turn, leads to no need for constant economic growth.
Couple that with the removal of corporate welfare (industry subsidies, protective legislation, draconian regulation, etc.), and you'll get businesses interested in the long-term rather than blinded to anything other than the next quarter...which in turn makes for a major shift in how everything works. The "sustainable" begins to apply to everything, not just the economy.
Again, very oversimplified - but there it is.