That's what I thought too... and here is my (uninformed?) reasoning:

When you point your location on the map, you're just telling the software where you are (roughly). Based on that information the app connects to dedicated A-GPS server that tells back what satellites are visible at that given date/time. The benefit of A-GPS is that GPS itself doesn't need to search for satellites. It already knows what satellites are there. Now the GPS only needs to receive satellite signal and calculate fix.

I just used my N810 GPS yesterday after about two weeks pause. When I was still home I had my WiFi connected, did go outside and fired up MaemoMapper. Immediately the GPS status was showing ~10 visible satellites... but calculating fix took another 2 minutes. Without A-GPS searching satellites alone takes ~1-2 minutes...