I agree about MCO. They have refused to let me in the expert lines several times. Normally when I am in a hurry. Not that it is a real expert line. As the OP states families who have no clue are in the line with you.
One time the man working the lines said that because I am by myself I can use the line they had set up for solo travelers. That one was fast. Haven't seen that line before or since.
On the other hand, DL apparently kept fighting and fighting in TPA and there is a priority line. Thank goodness because that line has gotten crazy in the last year.