I'm sorry, but from my personal experience most people claiming "they don't need the new features" are just too lazy to learn them. Of course, this doesn't have to apply to anyone in this thread since I don't know your workflow.
I already saved hours thanks to InDesign CS5s different sized pages and background pdf saving. There is stuff like this that increases productivity and makes an upgrade worth it, and not new filter xy in Photoshop, which one would only use once or twice a year. Another example, transparent gradients is new in Illustrator CS5, that's something I wanted since Illustrator 10 and I use it very often.
I know a graphic designer who is still working with XPress 4!

he is also claiming he doesn't need anything more, and that the newer stuff doesn't have anything to offer. When I mention fundamental things like, um, multiple steps backwards, he says oh I don't need that. But afterwards he complains that he has so much work and always has to work until late in the evening.
Again, it's not my intention to attack anyone, it's just my opinion that spending time and money in new software/features pays off in no time. Everyone has different workflows, and if I can save 15 minutes every day thanks to 2-3 new features, that's more than an hour a week - and more than 5 hours a month more spare time to relax.
