Myself, I prefer isolated deep dives to a shallow ocean. I prefer the worlds to be sectioned apart to where the local events of the campaign actually transpire. In The Witcher, the game did not force the player to slog through scores of miles of unrelated (and presumably uneventful) travel to get to Vizima from Kaer Morhen; it simply indicated the travel, and picked up during the hellhound ambush. Straight and to the point—as is best IMO. *Now I would have welcomed a random element that [potentially] generated a few encounters along the route, but to impose a realtime march through miles of terrain that would be either empty, or far too inhabited... no thanks.