ganulv posted (cited in part) earlier:
Weiss states that the resources used in the Italian Campaign and the strategic bombing of German cities could have been put to better use.
Having just read a book that covered the Italian campaign it is worth mentioning several times major components were removed to fight elsewhere, the French (North African) Corps to southern France (after D-Day) and the Canadian Corps to the UK to participate in the D-Day landings.

So in some respects Italy enabled Allied formation to learn how to fight against a respected, capable enemy and the move on to fight another day. I would expect individuals were moved too, way below Eisenhower and Montgomery's level.