Frightening…no…but very very exciting…off course it depends on the track, and on the driver.
On some tracks,like IGLS, there are no high G-forces turns, overall very flat…and easy for the driver, even if he is unexperienced.
In Some tracks…like Cortina, Winterberg and others…you have very tight high speed turns…reaching 6g of acceleration…
and that for sure you cannot experience otherwise…( excpet if you are a jet fighter’s pilot)
Also…if you driver is not a very skilled one, every time the sled bounces on the ice…you’ll experience some very painful contacts with sled frame and your hips, thights, shoulders…At driving school, I saw people unable to run for 2 weeks after some…not perfect downhills:)