It's easy to "hate" being busy or not having time to do some things, but I found out that being "busy" saves a lot of mental energy. Try being bored and you'll understand. 

You'll care about the single grass that sudden stopped growing when others didn't or that friend that you expected to reach out. Or you care about the movie that they cancelled half way or someone you leave with/around is suddenly coming home 1 minute later than usual. 
Your brain will be underworked and catching the most unnecessary information. 

I never understood why people who have sad experiences like death of loved one or some trauma start doing more work at home or work. It helps take your mind off a lot of things. Now I'm again thinking about how I'll "retire" earlier but still don't get "bored"