We take ours, and use it extensively. But, if you take one, always have it at the ready.
We start filming as we pile in the car on our way to Disney, and finishing filming as we sit around on our final night, reminiscing. On the final night, we have categories we discuss - favorite, funniest, etc.
We'll film as we're waiting in line, sometime during a ride (Test Track!), and, of course, for the postride review. Our last Disney trip (five days) produced five hours of tape. Some of its pretty boring, but some of it is classic. I mean, we have film of my older son and son-in-law putting on an impromptu puppet show in China, my wife making a bizarre hole-in-one at the Fantasia course, and my younger son's excitement over everything.
As I'm sure you do, we have tons of Hollywood movies at home. By far the most requested, though, are our vacation movies. Like I said, though, overdo, rather than underdo. You can always fast-forward through the overdone stuff. And, narrate!