I fully appreciate the comments about 'early queueing' ... but this was an ingrained part of flying with Ryanair since its inception, so it will take some time to retrain us poor SLF!
The problem with having only cabin space for 90 bags when a full aircraft can carry 189 passengers, has been addressed by 'free bags in the hold', once the first 90 bags have been carried onto the aircraft. This means careful monitoring at the gate with yellow tags, and since this procedure came into effect I have observed that it is not a given, depending on the airport.
Unless this procedure is applied across the board rigorously, then the queueing problem and subsequent delays in stowing hand luggage in often insufficient space will continue.
If one is carrying medical equipment (that conforms to handbaggage regulations and sizing) that cannot be stowed in the hold, it is nigh on impossible to be sure of keeping it with you if you don't queue ....