I'd say it depends on whether you have kids or not. If you don't, there are so many places to get "good" videos online of the parks/rides, etc., that yours is certain to be nowhere near the quality. Plus it gets frustrating when one person is always in the video and the other is always staring through the screen. I always feel like I can't talk to DH when he's filming because I'll "ruin" the video, but in the meantime miss pointing out things to him that we'd both enjoy seeing or discussing.
If you have kids, definitely. Filming their reactions to the rides, shows, characters is something you can't live without and much better than any of those rides, etc. themselves! It was such a hassle when they were little but now I wish we'd filmed more and treasure what we do have.