I've only lost control of my once. The rest of the times I lose traction, I have complete control of the car either done on purpose or unintentionally.
Hydroplaning is when the tires, worn or not, are no longer able to evacuate the water from the tread. This causes water to coat the tread and for you to lose traction with the road. Thus, you lose control and slide. Losing control is easier in rear wheel drive cars(fishtailing) due to a more direct power to weight transition. They tend to oversteer. For this reason front wheel drive cars are safer in general(easier to drive and control for the normal consumer, but not as fun to drive
). These tend to understeer. All wheel drive is definitely the best drivetrain for bad weather imo. These tend to understeer from factory, but can be tuned to oversteer or be neutral.
The best remedy for taking control of the car when you experience hydroplaning are these following rules:
1) Ease off the gas. Do not abruptly let off the gas. This can send you into an uncontrolled spin in some circumstances.
2) Do NOT hit the brake. This will only cause you to lose traction even more, making the situation even more dangerous.
3) Countersteer the wheel from left to right while centering on the direction you want to go in.
4) Once you feel the tires bite and gain traction again, slowly accelerate and get back up to a safe speed slowly. Repeat if necessary.
Technically, these somewhat follow the steps to drifting. Those who know this will agree with me.