Flying into the Orlando airport (MCO) there is no security wait - at least there isn't @ Terminal A.
Yes, the wait really depends on the time of year & day, but I've been to the airport 4 times within the past week - busy season here - & the lines varied depending upon the hour of day. It's always best to go early & wait, just in case.
One of the times that we were there last week, there were only two people at the ticket counter in front of us when we arrived & just as we stepped out of line a group of about 50-60 people - all wearing the same shirts - got into line & then were behind us in the security checkpoint. Just a matter of two minutes made a huge difference in our potential wait.
Just a little tip for those of you going through the security checkpoint, again, this was at Terminal A,: I noticed that everyone tended to go to the first few lines that they came to on their left & it was mobbed. We walked over to the other side & it was moving right along with virtually no line or wait.