I always have two bodies, both with grips, during shoots (10+ hours for weddings). Even when I had a 300mm f/2.8 I never really used a tripod or monopod. 70-200 is light compared to that
I will occasionally use a monopod if I am going to be shooting >4k photos in less than 2 hours all from the same position (sports for print sales). I prefer to do panning shots hand held.