There are good points here but many miss the point. You will not get consumer spending if people don't have jobs. What tax cuts and better regulations do is make job creation easier. Even with low taxes, job creation is very, very hard because entrepreneurship is hard. I had a business before trading and I have to tell you there's a lot of cr*p you have to go through just to be profitable. It is like the chicken and the egg, but I think we've found out that just dumping money into the system doesn't work as well.
Many don't like tax cuts because it helps the wealthy. True which is good because the wealthy are better at allocating capital than the government. They either spend it themselves or use it for investments that spur growth. There's a reason why the high tax states in the US are contracting while the sun belt is booming. It's been that way for a very long time.