To what degree? There's a wide spectrum of driving assists.
Traction control and ABS through to cruise control or the assisted steering (terminology?) we're seeing more frequently today?
For me the tipping point is whether I can switch the automated systems off, and change their parameters (within reason).
Those are more along the lines of tools a driver uses for assistance. I draw the line where if the car rear-ends another vehicle, a judge would never place the responsibility on me (because I wasn't even behind the controls).