What parent on a trip hasn't grown weary of hearing those words from a squirmy kid?
Yes, sitting in a car for hours can get boring for children, but there are ways to make it less so. The obvious way is for kids to entertain themselves with electronic games and other devices. Kids and even parents may be texting and communicating with other people on the internet, or reading e-books as they ride.
Those things can help to kill time on long drives, but vacations are supposed to be occasions for families to bond and become closer.
Taking a break from the individual activities and sharing old camp songs, making up a story together, counting certain things you drive past, sharing family memories, or taking turns saying something nice about each other can help create a sense of togetherness on long drives. I'm sure we can think of other ideas, too.