I try to read the forums twice a week or so. Then there is always some new things to see. I don't post often because I was burned by people for expressing my opinions on a couple of subjects.
Having said that, I have always enjoyed the forums for the social networking and lighthouse information available, not just the HL stuff. As seagirt noted, developing relationships within the forums made going to the reunions and other lighthouse trips fun because you could put names to faces, especially if each person had there Connected Collector's badge. It is like looking for that one HL you need, except you are looking for that one person you have always hoped to met.
It is through this path that my wife and I have meet some great people and formed some great friendships. We may not see each other often, but these forums give us a connection.

That's my two cents worth.