Mattes are great, but learn to control them.
If the track matte layer is taking up precious room in the Timeline, you may want to hide this layer. Press the Shy button for the layer, and turn on the Shy button for the composition.
If you animate the position, rotation, or anchor point of the affected layer, parent your layers so the track matte layer follows its mate.
Apply a levels filter to the track matte layer to boost contrast or to animate the opacity of the matte.
You can also use nested compositions as track mattes!