I have 12 harvester groups, once a year I give them each an order to go to a colony, equalize fuel and dump 90% of it. A few game months later I give them a single order to go back to the gas giant.
Fundamentally, this is better, easier, more efficient and less prone to oddities than trying to work out how to automate a system that requires remarkably little personal effort in my view.
I am not fond of micromanagement but the time cost to me the player is trivial compared to the time cost of just advancing the game by several weeks. I spend more time looking at mineral levels, population levels, what the status of my R&D is, etc then what it costs me to cycle my 12 groups of harvesters around. It is probably more effort to skim fuel off the civillians when I really think about it.
My exprience says the conditional orders are a nice idea not implemented well enough to make using them less work then not. So far that has been my experience anyway.