I can't say I quite think that much, nor do I think about the concept of thinking and what it does to me.
It ain't easy to make me depressed, or incredibly sad through thinking-well maybe there's one thing that would do it, but my mind unconsciously never thinks about that.
Whenever I sit around thinking it's normally a Fantasy thing, or some weird philosophy I make up and forget about a few minutes later. I tend to think of the latter late at night- on a stroll in the night, and it's dead quiet with nobody bothering me- unless the person is talking to me about the concepts and definitons of space and what could actually happen in our future. That only happens when I'm talking to an intelligent person who happens to be walking with me.
When I'm alone I may hold a small conversation with myself while in deep thought-it's what I do shoot me for it. I like to look at the sky with all of its pretty stars and the moon to act as eye candy while I think and speak to myself in hushed tones.
I've come up with thousands of fantasy ideas that way, and millions of things about space and reality- be it complete speculation and only makes sense to me. I've also created a few philosphical (sp?) ideas as well while thinking.
-Thought and thinking is my favorite thing, I can do and think whatever I want in my thoughts even if it doesn't make sense to others. I have fun doing it as well.
I've never been on either side of the spectrum, I may understand something after a while of thinking, but it never makes me especially happy, or make my day. Same goes with getting depressed (It takes quite a bit to make me depressed, I have only been depressed...perhaps twice in my life and for logical means)
Anyway I like thinking and I think of it more as a great gift, so far through my so far relatively short life I've never been hurt by it, nor have I been made incredibly happy by it. It kills boredom and is as interesting as reading a great book to me.
This turned out a lot longer than I expected...o_O