Based on my own experience and on what I've read here, it seems to me that there are two groups of JWs: those that genuinely believe the end is near and swallow everything the GB spews forth; and those that largely believe they've got 'the truth' (or the closest thing to it) but don't really know when 'the end' will come.
I also think that group 1 are a minority but are 'zealous' so fill many positions of oversight.
The blind leading the blind.