Starting often is a major point. No more reminiscing about lost time. Just experiencing the now, and the next half hour. It seems like the bigger picture of a project disappears and I only notice what is right around me. Its a lot easier to commit to the next unit of work when its only 30min, than to think about entire 8 hour days in front of me.

Your impressions here match mine (see Eluding Attention Hijacks).

I have also noticed that the anxiety that arises from having too many things to do, distributed in lots of hours ahead, might be closely related to Schwartz's Paradox of Choice -- whenever you chose to do something now, you know you are choosing not to do hundreds of other possible tasks, and it seems that the only way around is to put blinders and forget you have other stuff. And then, looking back, you'll have accomplished a lot.