I've been in there pretty much from the start (user number 1400 and something) but it always felt like a chore, something I "should" be doing rather than a pleasure. A combination of the design of the site and the people who tend to spend more time there than on the rest of the web.
In recent years I have re-posted my blog posts there in an attempt to stimulate conversations and drum up business but to little effect in either regard. I may lose out on the odd connection who relied on LinkedIn to keep up with my ideas and my activity but, to be honest, I am drifting away from that sort of work anyway.
It will still be useful as a big, self maintained, contact list but that's it.