EDIT: Gonna start turning this first post of the thread into a megapost for all of Rastsy's helix jumping videos, found on his channel here - he's contributing a huge amount to this and putting a lot of effort in, show him some love!
Found on Reddit, some really interesting jumps that 76 can do with his Helix rockets + sprint for only 40 HP to get to some spots he can't otherwise get to - the guy's only covered Hanamura so far. Jumping with 76's rockets somehow never occurred to me at all, I feel like a kid in a candy shop knowing about this now, so many cool jumps and spots left to be found. It's probably unintentional but if Blizz were planning to leave Pharah's ramp-hover in until they found it significantly breaking map balance I'm sure they'll leave in a neat and potentially very situationally useful trick like this.
All of Rastsy's tutorials and map-specific compilations:
General Helix Jumping + sprint jumping tutorial:
https://www.youtube.com/watch?v=9IAGzlGAeY0