You're probably talking about proximity flying. I've done a bunch of wingsuit flying, in groups, from a plane. Skydiving but with wingsuits. With all of the correct training and gear, it felt completely safe.
I never BASE jumped, but when I was skydiving a lot I was considering giving it a go, but still leaning towards the 'nah that's probably a bit too dangerous for me' side.
Then there's base jumping with a wingsuit... Something that if I had gotten into base jumping, would still have probably been too scary.
Then, about 100x more dangerous and terrifying than all of that, is proximity flying - wingsuit base, with the intention of staying close to terrain the whole time. These psychos fly through valleys, between trees etc...
Knowing what I do about how tricky it is to fly a low-performance, gentle easy wingsuit in a stable formation, the idea of flying these bigger, twitchier high performance wingsuits through a valley just seems suicidal. Absolutely nope.
Yes indeed, mocking gravity while hurling yourself directly towards the enormous local source of it all is much more sane (said as someone who has done plenty of both)