That because most of us have either had some previous experience with another heli or dedicated lots of time to a SIM. Some of us have both. I personally have had previous experience with an FP Fun Piccolo, crashed that so much that it eventually became more CA and tape than actual plastic and carbon.

At any rate I also have cars and trucks and one bad habit we drivers all share is that we do not have the delicate touch necessary for helis. Its usually full throttle or hard turns or extreme changes in control input in whichever direction. Helis require very smooth, slow, and constant control inputs, a skill that we as car/truck drivers lack and have to acquire through practice.

Another thing to consider is that cars/trucks only travel in one plane (2d), helis as do other aircraft travel in more than one plane (3d) and are affected by wind. To make a long post really short. You need to practice, practice, practice², practice³