I used to drive with ABS and TCS, but since GTS I forced myself to learn how to drive without TCS, only with standing start races and GR3 and high powered RWD cars I turn TCS on, at least for the start. Since my favourite brand is Ferrari, during races I set TCS to 1 because the car is very nervous and throw it's tail out on corner exits if you're not careful and during races I sometimes are, well, less careful on corner exit when defending or attacking position :-)
As for driving aids like race line or break point markers, I turned them all off, since they will learn you the track in a wrong way!