Like I said, I notice it a lot in progressives, where I can't always tailor my team to my park. If I'm in an extreme park for singles that cuts down on HR, for example, I may have 3 OF who are heavy on singles, and a 4th who is a .250 hitter with 40-50 HR. If I go on the road to a park that suppresses singles and boosts HR, then I want that 4th OF starting. Without the home/away lineup option, sometimes I forget when I go on the road that I want to make that switch.
As for being cumbersome...if you don't want to use it, all you have to do is click on "set to all lineups" at the beginning of the season, and that's it.