The only use for a system like this that I can see, is knowing where the aliens are in relation to your selected soldier. The problem with see/no see and shoot/can't shoot is that it doesn't take into account civilians, another soldier, splash damages, throughwall like from rifle and even aiming. (It pretty much aims for the centre of a square, these squares are kinda large and result in big changes of angle. The only way to get a smaller angle is to aim behind your target, and sometimes you can make a shot when normally it says you couldn't.)
Unless its going to take into account all of these things I'm still going to end up doing it myself so I don't see it saving a lot of time.