The issue isn't really the micromanagement but rather that late in the game when you have multiple groups fighting at the same time and all of them have tons of target-able abilities there is too much micromanagement. I like a little of it but late game it gets a little too much.
I do enjoy microing most of the abilities most of the time, but sometimes it's late game with tons of abilities researched, you have the enemy advancing along 3 fronts and you need the dragon to be out and unless you can pull off a crapton of clicks per second you won't be able to keep up on the micro even without getting the dragon out. Then it would be nice to turn 2 groups on autocast real quick and micro the biggest battle while swooping in with the dragon.
I am a fairly regular RTS player and while the early-mid game doesn't really need an autocast, the late game could really benefit from one. Also autocast is almost always toggle-able. If you don't like it you don't have to use it (and you will have an advantage as you are probably better then the autcasting) but sometimes it's better for those of us that while I am a decent RTS player I can't compete at the high end SC2 levels. Most people can't as that is VERY hardcore.
I do like the microing, and don't beleive it should be taken out, but endgame is a bit too much at its most frentic and some help might be nice.
