DO IT! Turn that dad-blamed thing OFF!
I, personally, HATE spotlight (the lady at the post office says, "hate," is a strong word, and I should not use it.... but, I digress).
Anyway, here's what I do to make my computer to run really, really fast (instead of slow jerky and choppy when Spotlight is running):
1.) Go into System Preferences, click on Spotlight, click on the PRIVACY tab.
2.) Drag your Hard Disk icon into that big window.
... at this point, you've told the computer not to use Spotlight. You're almost done.....
Now, go into terminal and type this EXACT thing (substitute "hardDriveName" with whatever your hard drive is named)
cd /Volumes/hardDriveName
Now, you're in the directory where the Spotlight index is. Verify this by typing:
ls -ainrst
A big list will appear. Towards the bottom of that list, you'll find this file that begins with a dot . :
.Spotlight-V100
That's the directory of your Spotlight index.
To remove it, type this:
sudo rm -rf .Spotlight-V100
and then type your password
There! Done! Now, you've disabled spotlight, and removed it's index, and now your computer will run smooth!
Okay, how do you find stuff? Install the app called "Find Any File." I'd google it and find the link, but I don't work for them, I'm just a big fan.
The ONLY thing you'll wish you had Spotlight for is searching your own email. It's worth living without searching your email to disable spotlight, in my opinion.
By the way, be careful with the Terminal stuff I mentioned earlier. One wrong character and you can destroy your whole system. But, just so you know, I did double-check my work, because I just did it all, myself, a minute ago, because last night I ran Onyx, which reenables Spotlight and I was wondering why in the H88l my computer was running so choppy today! So I just now disabled my own Spotlight. Yeah me!