Children and inexperienced ninja would be the ones to benefit the most from hand signs, since the hand sign positions might initially help the chakra flow better. After you use a jutsu so many times and get used to the way the chakra pathways for that particular jutsu feels you could open them up through memory and will power alone. But thats just my theory.
Water gushes out from the mouth like a waterfall and washes away the enemy. One can freely control the power of this technique with the amount chakra one releases. Having many variations, this is a basic Water Style jutsu.
The way I look at it is that the hand signs helps the user focus their chakara to form the jutsus, in the beginning they slowed down the speed of the hand signs to make it relevant. But as seen later on, when Kakashi does that water dragon jutsu again, (Super long one Zabuza uses and Kakashi copies) the hand signs are seen as a blur and almost takes no time.
The Water Clone Jutsu utilizes existing bodies of water to create clones of the user. Whereas clones created by the Clone Jutsu are simply illusions, Water Clones are real and can be used to interact with the environment and attack a target. While Water Clones possess a fraction of the strength of the user, multiple can be created at once, causing for a challenge for even the most experienced.
Water style: Water Dragon jutsu, a giant dragon of water with yellow eyes rose out of the water and headed towards Naruto who went through hands signs faster than anyone could see. Wind Style: Raging Wind Blades, he said as he blew huge wind blades that cut through the water dragon and continued towards Zabuza who had to let go of his jutsu that let both Kushina and Kakashi out as they landed.
The Lightning Style: Lightning Dragon Jutsu shapes a large amount of lightning into a giant, powerful dragon, which hits the opponent with formidable might, dealing physical damage. The ideal place to use it is near a body of lightning, but if the user's skill allows it, it is possible to use it even in a place where there is none. Kakashi,Naruto,Sasuke and Sakura were sent out to a s-rank.
The one who will always take the crown is Itachi. There are two kinds of jutsu: ones that need hand signs, others that don't. It will always be more arduous using techniques that required hand signs. We have seen people like Kakashi, refining his.
Water Style: Snakes Mouth. Water Style: Stormy Blockade. Water Style: Syrup Snare Field. Water Style: Water Basin Jutsu. Water Style: Water Clone Jutsu. Water Style: Water Dragon Jutsu. Water Style: Water Dragon Bullets. Water Style: Water Jaguar. Water Style: Water Prison Jutsu. Water Style: Water Shark Missile. Water Style: Water Vortex Jutsu.