Basically there aren't many jumps that provide a large benefit. There are 2 that are still quite powerful however, Horde side log jump to top of gy area would be the first one as it prevents you from having to go up ramp or tunn to get to horde flag room and you can ditch enemies.
The other useful one would be throwing a speed pot on at ally ToT, popping goblin glider or a slowfall potion or filled festive mug, rocket jumping and / or disengaging from Ally ToT and it will carry you far mid... But keep in mind CC abilities will now drop your character straight out of the sky (hoj)
Both of these jumps heavily favor Horde which is great as Goblin = Horde, but these jumps can also be done easily with any Faction hunter.
Another one that is quite fancy is being on roof of H or A base, you can easily jump as if you were headed down to cap and then disengage or rocket jump yourself to land on 2nd floor so you'd once again ditch any on you. Those are pretty much the only decent ones that come to mind and they are also quite obvious but you should be able to lose a few people with them.