One case where I like skimmed milk is when I'm using it to accompany a peanut butter, banana, and honey sandwich. I get plenty of fat from the peanut butter, and a modest amount of healthier unrefined sugar from the banana and honey, but in that context my meal doesn't need the extra calories from the milk fat and already has enough strong flavours that the milder taste of skimmed milk works well.

And yes, I use the natural kind of peanut butter with just peanuts and sometimes salt. The bread is commercial loaf bread but of a healthier variety than white, with several whole grains and nontrivial protein, for example.