I also absolutely despise the need for every ball to be thrown back to the keeper. Especially balls that go to mid off/mid on/cover etc. I see no upside from it and I only see a bad throw going for overthrows. Just hold onto it, or throw it to whoever is shining it.
At club level I absolutely hate when people don't back up throws properly. Firstly blokes on the boundary who don't come in 20m if a throw is coming in opposite to them but mainly the one where the person backing up stands about 4m from the stumps which gives them absolutely no chance to stop a ball that goes past the keeper/bowler. Stand 20-30m back, no one is taking an overthrow if the ball ends up between the stumps and you.
The throwing to the keeper I feel is an intensity thing.
Fielders not backing up used to drive me nuts as a dodgy keeper. I remember when I used to captain a lower grade team of mostly teenagers, i would drill this into them. Someone backing up both ends no matter where you are in the field, back up the guys backing up if possible. Every fielder should make them self useful every ball. It's a rare situation in this team sport where all 11 players can actually play as a team.