Yea, MCO is pretty poorly run. If you'd gone through gates 1-59 they don't even have the black diamond lanes up and running yet due to construction.

Half of it is people just being stupid or not paying attention. I used to joke all the time with the international travelers that Americans think the signs are for everyone BUT them. There was an extremely long line, and they had those overflow lines setup, where they start lining them up towards the food court. I was standing next to two German guys for about five minutes, and they were cracking up every time a passenger would walk up and try to cut the line. Then they'd be directed by AASI to where the line starts, and they would get this look of bewilderment on there face. "You mean that line is for ME?" (insert joke about TSA not being efficient.) It would happen within eyesight of the next passenger who would be walking up and the same thing would happen. It was a sad assembly line.

But back to your point. TSA attempting to direct people wouldn't work due to manpower and the fact that how can TSA tell you where to go? What happens if you go to another line then what they directed you. It's just a headache to begin with, and a headache to end with. Just find the shortest line, that's all I can recommend.

edit: It should be noted that I have no experience of working the black diamond stuff. Yea I had been to that side of the airport when they got smashed, but my side never received it before I left. I do have friends that work on that side, so I am a bit more familiar than it your average passenger, and understand it. However, I've never worked the TDC for it and frequent flyers out of MCO might be able to give you better information than I.