Water IS important, for all the reasons mentioned. And especially if you're exercising or sweating up a storm, you need to pay attention to your hydration.
But after the reading I've done on the research, I think that we sometimes pay much to much emphasis on people chugging water as THE way to hydrate.
Water is in all our food, and everything we drink. When the recommendations first came out about hydration and needing the equivalent of 8, 8 ounce glasses of liquid, it seems that it this was understood... but those recommendations quickly got distorted into "those glasses must be water."
The recent research suggest no real evidence that this must be taken in as water. See
this link for more info. It's a summary of the research with a link to the journal article. It's pretty readable!
In fact, the research also suggests that caffeine doesn't have the diuretic effects once feared, and caffeinated can be included in this intake.
So, what does all that mean? If you love drinking water, please don't stop (but do know you can overdo it in some extreme cases)! But if, like the original poster, you don't feel thirsty, I wouldn't worry about it. You are probably getting enough liquid in lots of other ways in daily life. Do pay attention to hydration in the heat and around exercise.
Anyway, that's my two cents...