I agree in the sense that it is all about choice where management is concerned, but a personal belief of mine is to micro, micro, micro. At first this seems somewhat laborious, (although my OCD wouldn't have it any other way :0), and it will feel like a game could take forever. However, you will soon find that the more you do it, your level of control will improve, you will develop a better sense of realising your end-strategy earlier and how to achieve it, it will also allow you to become more flexible in adapting to scenarios as they arise, i.e. meeting a previously unmet player and coping with what they throw into the mix.
I think the main reason for opting out of micro is due to time constraints and impatience, all I can say is it's that old chestnut; the more you do it, the quicker and better you will become. Although many people have advised that it is not necessary on the easier difficulities, I would recommend that these are the best stages to develop your micro-skills as the AI is obviously a lot more forgiving. In essence the key for me, is micro-managment although subjective, provides greater flexibility in the long-run, it also means you are taking advantage of all the game has to offer, and is somewhat an injustice to me if not indulged.