This cast is primarily a saltwater cast. You use it often when you are "sight" fishing for bonefish, tarpon and other species commonly found on the flats. If you have been there, it is often the case when you are standing on the bow of the boat looking for targets. Suddenly, the guide or another person in the boat says "tarpon at 10:00 o'clock". Many times, these fish on the flats are moving very quickly. Properly done, this cast allows you to make a 60-75 foot cast with just a few false casts. This is why they call it the "quick cast".
The Quick Cast - Chris Myers (YouTube)
The Salt Water Quick Cast - Capt. Joel Dickey and Gink and Gasoline (YouTube)
The Quick Cast - Chris Myers