Except that with the Reapers around to keep the peace, or aid in technological advances, or whatever else the Shepard-AI may use them for, galactic civilization would likely take a dramatic turn in a Control ending. Initially it would be as you say, but I doubt it'd even take a decade to see some dramatic shifts.
Destroy would change the least. It's just the current status quo minus the Geth (and EDI), plus whatever technological advances might be made by salvaging parts from Reaper corpses (which will surely be less than if they had live Reapers helping with those advances, as in the other two). Initial repairs of the relay network would take longer without the Reapers actively helping with them like in Control and Synthesis, but that wouldn't mean much in the long run.
Zevox