Well, BG is a turn-based type of game in a real-time engine. So yes, you have (or should) do everything on your own with every character and every few seconds (or ingame turns). You can give them behaviours but they are not the ideal way of playing the game in every aspect (like positioning). But it's clearly helpful if mages cast some spells on their own (like armour spells for themselves at the beginning of a fight) or priests can heal on their own. There will still be much micromanagement but of course less than in a situation in which you have to do everything on your own (like in a real turn-based game....)
In the end, there can't be more micromanagement in a real-time game than in a turn-based game (almost by definition).......
