Ever been to Six Flags Magic Mountain (SFMM)? They have some pretty extreme rollercoasters. In fact, SFMM coasters make Disneyland coasters seem like little toddler rides..
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Somehow, it's almost scarier to watch a GoPro video of a roller coaster than to ride the roller coaster itself in real life. I don't know why that works but it's like you get none of the thrills and all of the fear when you see the first person point of view, it's just terrifying dizziness mixed with a constant sinking feeling of plummeting to the ground.