Yep, you're absolutely right, the slide down the grate is the THIRD place that that kind of camera is used
And, as Master Qui-Gon pointed out, there might very well be a way to get across, but basically you're not supposed to. Our level designer for that level tried hard to make sure it was impassable, and as far as I know, no one has made the jump.
Just to be certain, this is the jump right after the Destroyer Droids arrive, where Qui-Gon makes the jump and you don't?