We've been at MCO a few times later this year, and it's something we do not look forward to. It can be a real mess. To be fair, our last trip earlier this month, we got through check-in and security in about 20 minutes, which was way better than we were expecting - but it was more of a one-off for us. If you are going to be flying out during a busier time, get there at least 2:15 to 2:30 early just to be sure. There are some things that really help, like TSA-Pre, if you have it. Worst case, like us, we spent a little bit of extra time eating a leisurely late lunch in one of the airport restaurants one the good side of security! That was better than the anxiety people are feeling sometimes when the security lines aren't moving.