disclaimer: it's not really boosting it's more using his ability to jump further and get into spots agents like Brimstone, Skye, Phoenix, etc. can't.

Video if you are too lazy to read: https://youtu.be/fFK5mfm5j3c

So I was sitting in customs and played around with yorus abilities when i realized that you gain velocity while you are in his ultimate, that may be pretty obvious but you can use it to jump further ( unfortunately not higher). I would NOT use the ultimate to get into these spots but you can use it to get information while you get into an elevated spot. I'm pretty sure nobody will expect yoru to pop out of his ult in a spot he normally can't reach, so you can surprise your enemies and may get some free kills. Some jumps are pretty hard so I recommend you practice them first.

I can really see the Ultimate being used for the A retake on Haven. You can go Heaven, pop your ult, jump on the big box, check site and jump on the box on short. If you time that with your teammates, you will get some free kills.