The long jump is very similar to the megajump from Ocarina of Time, except that it is much easier and does not require the Hover Boots or any special items. The trick is a forward jump that grants similar distance to the recoil flip and megaflip, except that Link can grab ledges out of it, a big advantage that those two techniques lack. It can be combined with the Zora Mask to reach even higher ledges.
The trick is very useful in any area where a large distance must be travelled in the air but also when a ledge is needed to be grabbed. This is useful in places like Snowhead Temple for jumping across the platforms without Goron mask, and is also useful in one method of Fairy Fountain Wrong Warp.