I was a member and supporter for about 10 years, but I let it lapse in 2015. As with anything in the world of photography, the gardens have become very popular and crowded even with off-hour access. The engagement rules have become very limiting, as far as where one can shoot from, understandably more people means less access. The Gardens always supported and promoted photography because of the world wide recognition it received.
I know much of the work was to build a better environment for the Koi Fish, not sure how that ended up.