> Dopamine is often portrayed as a pleasure chemical, but it isn’t really about pleasure so much as the expectation that pleasure will occur soon.

I noticed this as well. One time many many years ago, I was in grad school and doing research until later in the evening, and deliberately delayed dinner until I got home. I was anticipating a nice meal and decided to do some house cleaning and some misc chores. Knowing I had the meal "on the other side" made me do the chores with gusto and a certain "sharpness" that I usually didn't have.