I use Photoshop a lot for work and therefore buy it instead of have a warez copy. Due to it's price I'm still using CS3. CS4 and CS5 added nothing of use especially CS5 which just seamed to be a money making upgrade.
Photoshop CS6 is a completely different story. It's the first version in a long time that adds features that will get daily use and not just some new feature that you'll use once a month. It's a lot faster, supports video, and the content aware is excellent on backgrounds which aren't too complex, eg sky, grass etc. It's an excellent upgrade and the first time I've got excited about a photoshop upgrade in years. You can get the Beta version for free both 32 and 64 bit versions from the adobe website.