definitely NOT true as far as landings go. The only reason you should be using ailerons when landing is to keep the wings level. You're landing the right way, which is great.

Rudder turns, especially when flying slowly, is a good thing. As others have mentioned, rudder turns will prevent tip stalls in high aspect ratio wings, such as on scale warbirds.

Aileron turns at higher speeds seem (to me) to be more effective, but you're certainly not doing anything wrong.
Dennis-