I completely agree with this. Micromanaging in this game is like herding cats. They dont even obey their default behaviour settings most of the time. When in battle and having to pause every "round" is just stupid.
Then you're doing something wrong. Because i don't do that. Pretty much the only time i switch to the chars is to cast their buffs and to position them on hard fights like dragons (which needs to be out of the breath weapon). Other than that, they heal, crowd control, defend, use pots, etc all by themselves.
I like the fast combat of being a warrior and rogue. If i was playing a caster i would probably need to hold the fight more to position my spells, but since i don't i rarely 'hold' during combat. And this is on hard and nightmare.