Wow. So nice to see people have same problem and interest.
I do use graphs a lot until I get global coverage. Although not to the pixel level. I just wait until they accumulate enough noticeable activity at certain region and then start searching. As long as they are there for a day or so it is pretty easy to find them there. Especially for more narrow regions, of course. South pacific is the exception being so vast that combing it with one triton and two barracudas may not be sufficient.
I also consider this a feature since the information is directly presented to the player. Sort of population reports about UFO sightings. However, this is very much tedious thing to spin clocks in 30 minutes intervals, check and recheck graphs for hundreds time during the game. I count this a waste of player time.
Therefore, I have introduced a simple feature stopping clocks as soon as alien activity piles up at certain region and display the popup with that information.
https://openxcom.org/forum/index.php/topic,11659.msg159960.html#msg159960Currently it waits for 5 hours continuous activity before annoying player but could be customized as needed, of course.
P.S.
I still think it is an important feature even if game does not provide graph info. Otherwise, early game would very much dependent on random chance.