Moving averages can be useful, but only along with other confirmations, like momentum. I have used them along with momentum, %R with good results.
They really are just visual illustration of price action. But whatever helps you make money, do it.
I will say this, during regular market hours, I would not attempt a scalp unless I was using a chart with moving averages and other confirming signals.
Trading for 12 years here, and making money.
Cheers.
(the types of moving averages are going to vary with the vehicle and the time frame).
I am specifically referring to day trading only here.