OK, but this state of disembodied existence is different for a saint than for any one else, excluding, of course, the Holy Mary altogether from this conversation? Since the saints not only hear our prayers but intercede for us and perform miracles?
There is nothing that says that the souls can't pray, or hear our prayers. For humans, the natural state is body and soul. For the Saints, perhaps their Christ-like state (theosis) is so blissful and comoforting, being closer to God, that they do not suffer as much in their unnatural state.
As for miracles, Saints do not perform miracles. God does. They may be the conduit or intercession, but the miralces would be God'e energies, not human.