Melee players have been complaining about Smash 4's limited movement options for years, but now a whole new slew of techniques called "bidou" have been discovered to make Smash 4 a whole lot faster.
The core of the tech relies on pressing and holding the special move button. It also requires a Pro controller, and for just about every button to be remapped. Although competitive players will be rolling their eyes at using anything other than a GameCube controller — and despite the initial awkwardness of holding down the left trigger while pulling off quick double joystick moves — bidou more or less brings back the infamous wavedashing of old.
Bidou opens up the possibility to make perfect pivots easier, pull off crouching perfect pivots, sliding spot dodges, standing dash attacks, and achieve frame accuracy on wall jump attacks. It also makes dash dancing much easier and opens up a brand new tech called "quick step," which is an even smaller movement than the perfect pivot. What that means in short: reduced lag, better momentum control, and being able to get moves out when you need them.
Unfortunately, wireless controllers are banned in many Smash tournaments, and some players speculate that bidou's many benefits will be fixed in the next patch. In the meantime, this new tech opens up a lot of options that serious players are sure to at least experiment with.