Is Photoshop really improving in new versions e.g. CS5?

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Hi mylotters! I'm not a professional Photoshop user. But I can say it is a must on my system. I was looking at my interests on MyLot, today. There are few discussions on photoshop and all are rather old (more than one year). It made me thinking if Photoshop is really improving or it ended on versions 6-7? Actually, the tools I'm using are the same as that old versions. I can't distinguish if these tools are improved or optimized in the new versions? Or if there is new really useful tools and I didn't see them yet? I saw the new 3D tools, but actually I don't think photoshop is a good place for them. Maybe adobe is adding some useless tools together with the changed look to sell it as a new version. What do you think? Please tell me if you found new useful tools or improvements in the recent versions.