Once you learn to shoot DAO, you can pretty much pick up anything else, and have no troubles shooting them reasonably well. If you only learn on SA triggers, the reverse isnt normally the case.
I think many dont ever bother to learn, and thats why you hear a lot of complaints.
It does take a little extra effort, and a lot of dry firing helps, and once you get your muscle tone up a little, and keep your focus on the sights, and not the trigger, youll start to see things improve. If you practice regularly, you will see improvement pretty quick. Once you understand things, and see the advantages to shooting DAO, I doubt youll be thumb cocking much, if ever again.