Flash photography on dark rides make me crazy for a whole host of reasons. I've been in the last row on Pirates when someone in the row in front of me felt it was okay to turn backward and flash a photo right in my eye. It was not, and I reacted accordingly.
I fail to understand how my taking a photograph in an attraction without using a flash or any other lighting assist has any impact at all on another guests experience. I'm making the obvious assumption in this statement that I'm not doing so in such a way that I expect another guest to get out of my way and I'm otherwise not being any more of an obstruction to their view than my head would be. I completely understand that many guests do not have either a camera capable, or the photographic skills (nor desire to have them) needed to achieve that which is completely fine. However, for some photography hobbyists, it's an an interesting (if frustrating) photographic challenge to get that perfect dark ride shot without any additional lighting. How is that compromising anyone elses ride experience?