We hope you like using masks because certain effects rely heavily on them.
Path Text
Audio Waveform
Audio Spectrum
Stroke Fill (closed paths only)
Smear (closed paths only)
Reshape (closed paths only)
Vegas
Inner Outer Key (closed paths only)
Particle Playground can also use a mask shape to define effect boundaries
Certain effects have positional attributes into which path data can be pasted
Lens Flare
Spherize
Most distort effects