It's trite but I'm rediscovering the imporance of speed. All things being equal, you increase the speed of iteration/feedback, you increase your motivation to do more.

Having a live design editor where I can make a change, see it instantly, ask AI to make a new feature, toggle it off... just feels smooth. I'm designing in hours what took me weeks of dreaded procrastination.

Instacalc, after 5+ years of a similar design, can breathe a bit better.