YES!!! In the books which are far superior, The Army of the Dead have no actual powers to harm, but their ability to scare is what made them useful. What really helped when Aragorn came to help Minas Tirith, is the Dúnedain, and Elladan and Elrohir, whom I hate that they cut out of the movies!
This. I would have much rather have seen Aragorn bring the Grey Company and the reinforcements from the Southern Fiefs to Minas Tirith.
To be fair, it did cut the runtime from 6 hours to only 3.