Mrebo said:

As far as telling the stormtroopers about the prison section, that was a clearly a ruse since 3PO already knew the stormtropers knew where Luke was and was pretending to be an imperial droid. But the basic point holds.

Ah, yea, got that mixed up apparently :)

Yea, seems like whatever line that could be potentially bad in the OT, is still salvaged (and then some) by either good delivery, or some degree of irony.

"That's not a moon. It's a space station." could easily come off as cheesy. I believe it's even on some "cheesiest movie quotes" video on Youtube.
But come on, that moment was just epic :)