We did this exact flight in May, and are doing it again next week - I'll pop back and update this thread.
In May: US Customs was the big bottle neck. Security was busy, but moved fairly well. We had Business Class seats, but were travelling with someone else in Economy, so we did not take advantage of the expedited line through security, which would have saved us a few minutes at least, and gotten us into the Customs hall sooner, which would have helped.
Only about 1/3 of the Customs booths were staffed, which caused a serious backup in the line. All around me I heard people asking to cut the line because their flights were departing, but security roamed the line and anyone attempting to move up was sent to the back again
We ended up sprinting to the gate and made it with about 2 minutes to spare. There were at least 3 passengers who did not make it.
My advice: As someone from WPG I know, changing your flights is not an option, so you have to make the best of it. Everyone in your party should use the lav before you land. You don't want to waste time in the washroom. Don't stop for snacks, or shopping - head straight to security, no delays. You can get something to eat on the departures side if there's time.
You might also try to flag your Flight Attendant during the second half of the flight, and let them know you have a tight connection. If there are just a few passengers connecting to MCO on your flight, they might make an announcement and let you off first.
May the odds be ever in our favour