The automatic ones are ok for those that don't want to bother caring for the animal...then again some don't change their water everyday either.
We use feline pine and regular boxes, we have 4 cats and they get cleaned twice a day. We have 3 boxes.
the solids are easy to remove, for the urine that turns into sawdust we use a spoon like below and shake the litter into a gallon sized baggie. The pellets stay in the scoop and the dust falls into the bag. Every cleaning we basically fill the bag.
It's pretty unsanitary to have 'poop' just rotting in you home if you ask me, but more so if the cats had to wallow in it to use their box.
The scoop we use looks like this:
It only takes my wife about 10 mins to go through the 3 boxes.