We havent upgraded to Gold, and dont think we will, because we dont do alot of getaways on II, we usually use last call on RCI.
There are other discounts with the GOLD membership such as dining discounts (or buy one/get one free), movie discounts, etc. There are discounts are various local attractions (bowling, golf, etc) and even discounts to some Ticketmaster sales.
Unfortunately, I'm not very good at remembering to search for the discounts prior to going out. Once printed, they are only good for a couple weeks, so I can't print a bunch and stick them in a drawer (though I did use a few for discounts at some Willliamsburg area restaurants).
A Hertz Number One club membership is also included in the Gold Membership ($60 value).