Personally, I find 7DMT less intense than Barnstormer, mainly because it seems to be slower and gentler with more gradual turns and declines. It is, however, longer than Barnstormer.
If you're sitting near the front, it's especially gentle. It feels like I'm being slowly lowered down each hill and don't really pick up speed until near the very bottom. At which point I'm soon heading up another hill, so it feels like we slow down almost right away. It's a little bit more exciting in the back, but the ride video/photos are better in the front.