Some economists argue that if the economy currently needs to be stimulated to remove it from a recessionary gap, how government spends more money (on X or Y) matters less than the fact that it does...

Some economists argue that if the economy currently needs to be stimulated to remove it from a recessionary gap, how government spends more money (on X or Y) matters less than the fact that it does spend more money. Do all economists agree? If not, what do they say in response?