[Unit experience] What are the effects?

[Atraphoenix]

Surely that's morale, not discipline?

I've noticed that levy hoplites take longer to change formation than professional hoplites. I click-and-drag unit layouts a lot, so individual soldiers have to rearrange themselves within the formation. I always thought that this was an effect of discipline - how quickly and effectively a unit can obey new orders. Levy hoplites will mill around forever, whereas professionals nearly always get into formation before the enemy charge hits

When I win a battle against phalanx argies are always the last men on the battlefield.
do not forget disciplines soldiers are not affected as levies when general falls.