@Plod2 - As Tezster said, when you get used to a wheel you will find you turn it less and less in order to make the same turns. This is because as you become experienced you will complete part of the turn on the brakes and will turn in at the exact right moment after braking at exactly the right moment.
If you do the time trials and load some of the top guys laps you will see that they steer the absolute minimum because they take the perfect line and pivot the car on the brakes. The license tests and also Tsubaka are good for learning this technique.
When you get to the very fast cars such as the Gran Turismo formula car and the Red Bull X you may find it hard to steer enough, but I think this is mainly because the faster the car, the easier it is to miss the braking and turn in points.
I used to find hairpins very difficult, such as at Eiger Nordwand, but now it is not a problem unless I use the fastest cars - which are too fast for my skill level and fading eyesight!
I do wish however that PD would put an adjustable steering rack in the tuning options - I raised this on the GT6 thread. I would like the turns lock to lock to match the rack in the real life car, so for example a Lotus Elan would be 1.8 turns (or 648 degrees). The tuning options would be: standard, fast and custom rack enabling you to set a rack appropriate to your style. I would rather have this as a tuning option adjustable for each car than altering the wheel rotation globally in the game.
The above suggestion is just a nice to have as I don't have a problem with making the turns, except sometimes with the fastest cars where my skill level doesn't match the speed of the car.