I'm assuming you're referring to a flight home after returning from a Port Canaveral cruise. Noon is a little tighter than I'd like personally but it should be fine (even with the 45 mins to and hour) commute from pier to MCO. Just be sure you're among the first off. Either bring your flight itin and provide a copy to the Purser and request priority disembark or do the self assist as you mentioned and carry tour own bags off. Take a cab, it's quicker than a transfer. You've got time for it not to be an issue but don't waste any time. If you're late arriving at the airport they'll give your seat to a stand-by passenger.