It looks like your last trip was in 2015; things are much tighter now after the Paris bombings then they were in 2015.
We just got back and saw some people with obviously full cargo shorts pockets bring pulled out of the no bag line and told to empty their pockets.
Any bag, no mater how small will be checked.
We went at various times and there definitely were longer lines in early morning than later.
One thing we noticed at MK - for the morning, they set up tables near the Guest Relations outside of the gates. As guests were coming in from the buses, they were going there, making long lines. A security CM was telling people to keep going to the left, where the bag checks were before. We did and found very short lines there.
The lines fluctuate with the arrival of boats, monorails and parking lot trams at the other parks.