I have three kids. 10,8 and 4.
They are very active kids involved in a lot of extra activities. Little League, Boy/Cub Scouts, school band, Ballet and Tap, etc.
I am a SAHM and devote my days and evenings to them. (Thankfully, I get some down time at 8pm when they go to sleep!

) My husband is a 911 Dispatcher. That makes us a one income family.
They love to read, color and sketch. We do puzzles, take hikes, go to the beach and ball games.
They also go out to dinner with us and we are quite proud of how well they behave.
All that being said...
We have a DVD player that came installed in our Suburban. The watch movies or play Scene It in the car on any trips longer then 2 hours.
We have a portable DVD player that makes every plane trip with us to WDW. My 4 year old daughter watches that, for our sanity and for those around us.
My sons' play their Ds's on the plane or, listen to their iPod's. They each have one.
We have to have Captain's chairs in the middle row of our truck so that my middle son and my daughter are not sitting next to each other or, they will argue about who was looking at who. Of course, the two boys can't sit next to each other either. That will result in who was touching who.
They are great kids but, they can get bored too. Nice things do not happen when they are bored.

So, we let them watch a movie or play a game.
One of my sister's puts her DVD player on the second her kids are strapped in the truck. It may not be right for my family but, it works for hers. Who am I to judge??? We all do what we feel is right for our family. I know I am a good parent. DVD player, iPod's, Nintendo's and all.