Well done. Do you remember what you had for choices? Because I made pretty decent choices, but I was still a decent way away from Synthesis when I looked it up later.
Shepard gets up and has a long conversation afterwards, and then goes on to actually activate the Crucible, so it's not like they would've remained unconscious for long. Also not being able to figure out how to work the elevator is bad writing considering the alliance built the bloody thing. This isn't some ancient warmachine they rediscovered. It was built from ancient blueprints, but you know, actually built. If they couldn't figure out how to work the elevators they would've put in a ladder.
The whole Star Child sequence is just plain bad, and really drags down the whole ending. You know what else might've worked better? A video phone call with your allies. They explain how to use the Crucible, and start arguing for you to pick the various options. TIM/Salarians argues for control, and isn't obviously indoctrinated, Anderson and/or, I don't know, Wrex argues for destroy, and if you reached the appropriate level EDI/Geth might argue for Synthesis. They don't know if they are correct, and don't know what the consequence will be. You can even end up locked out of certain routes if you kill TIM and cured the Genophage for example. Or locked out of Synthesis if you don't solve the Geth-Quarian war.
And in the end they agree on a compromise. You decide. They trust you and feel you're the best person to decide how to use the Crucible. The only person even.