Pretty much. Displaying velocity lines in Blender is sadly the closest thing to seeing the final product at the moment.
Baking the vector field’s particle system transforms and advancing the timeline is also a good way to get a general idea of how the vector field will behave in the engine for simple systems, but will only work if you’re using force fields to set up the vector field to begin with. Any velocities created by the vector math functions in the tool won’t influence the particles at point.