G'day pplpeter and welcome to the forums.
I fly the Boeing 717. With an EFIS flight deck it's not fitted with the traditional skid, or balance ball. Instead it has an electronically created trapezoid (basically a triangle split horizontally in the middle), which is displayed on the PFD (Primary Flight Display) and gives similar indications of balanced flight as does the traditional ball.
If one is in a skidding or slipping turn, the bottom of the trapezoid slips into, or skids out of the turn, and to make the turn balanced, one "steps on the bottom of the trapezoid". That is, of the bottom of the trapezoid is to the left of the top, one applies sufficient left rudder to "squeeze" it back to a proper triangle shape.
Now, in the 717 if one doesn't use rudder in the turn, then one will be presented (usually) with a skidding turn indication. Some people ignore this, others, apply just enough rudder to return the turn to a balanced state.
I believe the advice not to use rudder in the turn in a jet stems from the introduction of the hydraulic powered rudder coupled with the speed of a jet. Too much rudder can be catastrophic.