To add to what the other guy said, Supreme commander allowed your units to synchronize shots, for example for the big guns on battleships, useful for punching through shields.

They also allowed you to queue orders, display them and then edit them. So you could set up one big patrol path for 100s of helis and fighters and defend your territory that way, and when you want to expand you can drag the patrol points and all of those 100s of units would automatically adjust.

Also there were heli transports with lift and drop points and you could use that to ferry units quicker than they would walk. So you could set the drop point closely behind the frontlines and advance the drop point with the front line, allowing for quicker resupply of troops.

Quite a bit more advanced than you would see in starcraft or AoE2 overall.