In the 2009 review (2nd reference below), Voineskos and colleagues did a literature review of skin graft donor-site dressings. They noted that although there is no clear evidence that moist dressings are any better overall when compared with dry dressings, there is evidence that moist dressings tend to be less painful than dry dressings.
The authors state (bold emphasis is mine):
The ideal dressing should protect the wound from desiccation and at the same time permit gas exchange to accelerate reepithelialization. It should be impermeable to exogenous microorganisms, comfortable for the patient and the ward staff and associated with only minimal labor input. Moreover, the dressing should be flexible and pliable to permit conformation to irregular wound surfaces. Resistance to linear and shear stress are required as well as good tensile strength to resist fragmentation and retention of membrane fragments when removed. It should, furthermore, be adaptable to the varying dimensions of donor sites and, in spite of everything; it should also be of low cost. Existing dressing materials meet some of these criteria but fail to fulfill all of them, especially in larger donor sites.
Pain at the donor site during the postoperative period was consistently low after wound coverage with both materials, considering that 90% of the values assessed by the six-items pain scale were equal to or less than 1 (minimal intermittent pain) at both sites.
However, when patients were asked to compare both sites, a significantly higher percentage of MPD sites were rated superior to the Aquacel® sites
respective price level.