I just got a D3000 as my first digital camera, and right off the bat found the kit lens(es) weren't up for what I wanted. I like night photography, and the aperture settings on my 18-55mm and 55-200mm Nikkor AF-S DX lenses (I believe 4.0-5.6) wasn't enough to let enough light in. I've got a 50mm f/1.8 on order I hope will become my go-to lens for most shots (I was using the 55mm setting on both original lenses), and am looking forward to playing with it.
The pictures the D3000 takes are LIGHT YEARS ahead of the little point-and-click Olympus I had before. Much better color and detail definition - it just makes me very happy. I'm still playing around with it (hope to try some bokeh stuff with the 50mm on the way) and learning the settings, but once I got used to having to look through the peephole and turned off the auto settings, the camera really came alive.
Now to figure out HDR photography and photo effects with filters. It's just the beginning of a wonderful journey in my eyes.