When I play this, or GTA V, I am amazed at how much dialogue there is. Not only is every cutscene fully voiced, which must have taken tons of time and effort on its own, but almost every mission has dialogue when you're riding to and from the objective - which tends to be even longer that the cutscenes. How do they do it?
Also, I know San Andreas had some dialogue during car rides, but was GTA IV the first game to have full conversations in practically every mission?