Am I wrong that you'll have to point the ship at each object to see the analysis of that object? That is the core of my objection, after all because THAT will take more time than the system map TO REACH THE DECISION POINT of the system's worth in terms of further exploration. I don't want to waste the time looking at potatoes, even if it is only TO DETERMINE that they are potatoes not worth my time in the first place. With the current system, I have visual queues IN AN AGGREGATED image of the bodies, even if I don't have specifics.
You are wrong in a way. You won't be pointing the ship at each signal to resolve it, but the new scanner suite. So it won't be tied to your ship's supercruise performance. Exactly how fast it'll be we'll have to see once the beta releases.
As to whether or not you'll reach a DECISION POINT earlier or later depends entirely on WHAT that decision point is in your particular case. Some things will, with a bit of practice, be as fast or faster than the current system. For example, picking out ELW's. Or seeing whether a system only consists of "potatoes". Sure the presentation will be very different (System Map vs frequency scan graph), but a lot of the information will be present to make these kinds of decisions.
Other things will be impossible (as far as we know based on what we've seen so far) until you have resolved (or at least viewed the "blobs") some or all of the bodies in the system. For example, lots of objects with a common barycentre or a GGGG.
BUT whether or not the other changes will make up for those losses or not remains to be seen. The new mechanics appear to close the door on certain activities, but also promise to open brand new doors (or at least widen them significantly) for other activities.