Probably the biggest difference for me happened when I started considering my energy level and motivation as resources equal to things like "near a phone". (Which our host on this site gets into a bit in his recent talk).

I adjusted my contexts to include "easy" and "needs concentration", for example. When I'm having trouble getting getting started, I've got a few things in "easy" I can start with to get me moving and into a productive state of mind. Being able to pull things that require a lot of attention when I have time and energy makes the quality of my work on those better.

And when I do a weekly review, looking at the balance between easy, difficult, quick, or time-consuming tasks and my calendar helps me get a realistic sense of what I can accomplish for the week. And those details also help me evaluate my priorities - if I realize there's a difficult, time-consuming set of tasks coming up, I know that's a list that needs to have a really good reason to be in my workflow, otherwise it's time to scrap it or find someone else to do it.