I am one of those people who has been verbally reprimanded. On our trip in June 2000, I was videotaping Pirates and made it all the way through the queue area, onto the boat, and to the scene where the skeleton is steering the boat in the storm, when a CM announced over a loud speaker "NO VIDEOTAPING!" I did not recall seeing any sign or other indication of this rule anywhere before or during the ride. Moreover, I do not think I had any special lighting on.
My husband gets annoyed by my constant videotaping anyway, so he always tells people "they stopped the ride and made her turn off the video camera." This is absolutely not true, but he likes to exaggerate.
Imagine my surprise when, on our trip this past month, a man who rode on the same Pirates boat with us was able to videotape the entire ride from start to finish with no problem. I thought they must have lifted the restriction, so I tried to videotape the ride when we returned to ride Pirates another day. I made it through the queue area and was just about to enter the boat when a CM told me there was no videotaping or picture taking allowed. At least I wasn't embarassed by a loud speaker announcement this most recent time.
Now, I am always very attentive to signs or other indications of videotaping and picture taking restrictions on each attraction we visit. I have videotaped the queue areas of most rides, such as Space Mountain, Tower of Terror, and Rock N Roller Coaster. I just put the video camera away before I ride. I have even videotaped the entirety of Test Track, outdoor loop and all.
However, be aware that the rules are different everywhere, and you may not always be able to tell what the rules are. Have fun though. I love watching my videotapes over and over.