I pretty much always use it to wedge all of my planets about 78 or so, and it seems to work nicely. Without it, the general strategy is to run a bunch of freighters (I usually try 20-40) from that planet, which will tend to collect food from nearby planets and keep it going. Trouble is, long term eventually *all* of your planets will turn into this and the expanding ring of starving planets mean the freighters go farther and farther to keep them alive.
Just mind controlling at around 75 so that it finishes around 80 or slightly less seems to work and you can run a stable empire with tens of thousands of planets.