For me, it simply doesn’t feel like “work” in the same way working in an office or in a factory does (I’ve experienced both).
Maybe I’ve been lucky, but a typical day for me is turn up and exchange a bit of banter with the lads, do vehicle checks, get loaded up and get on the road. As long as I’m doing things right I am left to my own devices.
It honestly doesn’t feel like work. It’s like I go to work as a hobby and money coincidentally appears in my bank 
PS agree with Steviespain … concrete mixer - best job ever!