Thomas, as someone else (I think
JRut) said, I surprised that you are surprised that this still happens. And it will continue to happen.
I know personally the times I've found myself ball-watching is when my schedule has me jumping back-and-forth between 2-man and 3-man. Luckily I've become proficient enough to catch myself and adjust my eyeballs accordingly.
This season I've only worked two 2-man games and I noticed I haven't caught myself ball-watching in my 3-man games.