The part of CS4 that I tend to use most is the part which let you "vieuw" 3D models, and makes them paintable! Thats really handy when making textures and stuff... I do need to get the hang of it though.
I think that if I had to buy the new version, I wouldnt have had it. But my school pays for me, so why not

That is really the only reason for switching, because it is newer... The "improvements" in CS4 arent that big compared to CS3, Is see CS4 more as an CS3.2 or something like that.
Dont know if this helps you though, as you seem to have fled to forums
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