RC low-pass filters for op-amp power-in pins?
I found an article that discussed using resistors in the power lines of op amps (top of page 47). They say that in troublesome cases, you can add inductors to the power lines along with the decoupling capacitors. Or for a cheaper solution you can use a series resistor in the 10‎Ω to 100‎Ω range to form a low-pass filter. The drawback is it will reduce the rail-to-rail voltage range (since there is voltage drop across the resistors).

My interpretation is that adding resistors can be done if necessary, but adding them by habit is probably more harmful than helpful.

Edit: article is "The PCB is a component of op amp design", Bruce Carter, in Analog Applications Journal - Texas Instruments, Aug 2000, p 42-47.