As has been said above, MCO security for Airside 4 gets very busy late afternoon, as all the long-haul flights to Europe want to depart in the space of a few hours. At peak season, there will be 5 Virgin flights, 2 BA flights, 1 Lufthansa & 1 Aer Lingus.
That said, back in May, I was amazed by the TSA - the screening was almost pre-9/11. Leave everything in your bags (laptops & liquids included), take no metal off your person (so keep belt & watch on), keep shoes on etc.
Suffice it to say I got a far more thorough screening at Leeds Bradford a couple of weeks ago, when the zip & button on my jeans activated both the metal detector & the body-scanner. Even got a good telling off from the security screener for looking at the screen of the body scanner to see what "zone" of me had activated the alert. (Err, don't put the screen where I can see it then!)