My iPad 2 meets my occasional usage pattern just fine.
It's simply an additional device that doesn't fulfill any primary role for me, nor do I want it too. I leave it lying around the house for those times when I simply want to pick it up, browse the web for a short while, look something up or the like.
For any other usage I am far happier with my Fast & Fun MBP with it's stellar keyboard, SSD, beautiful 15" hi-res anti-glare display, and full power to accomplish all I want.
For mobile use my iPhone fits the bill quite nicely, so I have no reason to buy an iPad 3 to replace my iPad 2, just to have the "latest". I just don't use a tablet that much.
I'm far more eager to get my hands on the next iPhone.