That makes sense, the short menu is better for new users but if you've been here a while, well, there was nothing wrong with the old menu so why would you want to change?
...or, new users haven't yet figured out how much easier it is to navigate using the long menu, and since the long menu isn't recommended, they are hesitant to try it out. Then, before they get brave, they're already used to the short menu and don't even feel like seeing what all the hurrah over the long menu is. That's my take on most of the new users.
Regarding old users, can we get data on how many of the old users are drunk when they log in and what percentage of them are able to use the short menu without puking and/or passing out? That might help us debate whether or not there is a correlation between menu usage and ability to find/keep a girlfriend.
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!