Each weekend, for the past 3 weekends I have sat and thought for an hour or two.
I can honestly say that there is a distinct benefit for taking time out from your busy day, or week, to sit and think. Even if it is just for an 15 minutes.
Some of the benefits I have found:
1. Relax - it allows me to stop and breathe, free from stress and anxiety because I know that for the next time span, I don't have to worry about anything.
2. Extra insight and wisdom gained - I focus on a specific issue that is confusing me, or something I have read, or a quote I have heard and by focusing on it, I flesh out the details of "whatever it is" and gain greater wisdom accordingly.
3. Appreciation - I learn to appreciate the world around me with all it's details, especially the natural world.
4. Focus - I get focus to go forward into my day. Refocusing myself on what matters and reminding myself to let go what doesn't matter.
And that is why I think it is good to just sit, breathe and think.