Yes, things have changed greatly. In WWI and WWII, young men rushed to enlist; it was a societal norm. Families and communities were heavily and emotionally invested in the war effort. With an "all volunteer" military, today many families have no direct contact with people who serve so they are removed from the emotions and concerns that come with having loved ones directly in harm's way.
Previous wars asked citizens to make personal sacrifices or purchase war bonds to help with the cost of the war. Our conflicts over the past 15 years has asked little or no direct sacrifice of us.
And then there are the technologies that are used to fight today's wars. Many of today's weapons are located a half a world away from the battlefield. The current methods of fighting are a full century away from the trench warfare of WWI.
The civilian populations located in the actual war zones of today probably experience the same horrors that were experienced by the civilian populations in past wars, but the experiences for the rest of us are much less intense.