Personally I use the sliders, and I think they are the best thing since sliced bread, as they say. In the past I would need to spend ages playing with curves and the basic sliders to get the results I was looking for. Now I can achive that in seconds with Highlights / Shadows. Actually for what I like to shoot the hardest settings to absolutly nail are white balance and the white point. Everything else I will know what it needs or (black point) is a case of winding the histogram to the point that I know it will need to be.
I have yet to have a play with the curves tools, I usually just leave it oneither the linear or medium contrast defaults.
Alan