For me, it's an odd situation. From just a photography standpoint, I can get by with almost anything. I've taken shots that have been very popular, published, and sold well as prints with very basic equipment. However, as a "photographic educator" it's tricker since I need to keep up with the latest and greatest for videos, books, and workshops. Sort of a weird mental dichotomy.
The truth is, gear has long ago lost its luster for me. I look at cameras and lenses as a means to an end - little more than a bag of tools to get the job done. This doesn't mean I don't want
good tools, just that I'm not usually very excited about them. My new D6 sat, unopened, in the brown UPS box for nearly a week before I actually bothered to open it.
For me, it's the experience of shooting. I enjoy going out, finding subjects, and sharing what I capture with the world (or as much of that world is willing to look at my work). One thing I tell people is that when I'm face to face with an exciting subject in the viewfinder, I am not thinking about the gear at all. In fact, at that very moment, I may not even know what camera I'm using. I'm totally in the moment, only thinking about the shot. That's where the real fun is
In the end, I'll pick the tools that I think will get the job done. If a new tool comes out that seems like it will make the job easier to get done (better AF, faster FPS, etc) or allow me to spend less time messing with settings and more time making (what I pass off as) art, then I'm interested.