yup. memory is so cheap now it's not funny.
I'm a gamer and have multiple windows/apps running at once.
you are using 64bit? i assume you are. yes. you will get more BANG for BUCK buying an SSD if you do not have one. at $1/gb i would go SSD first, then ram. if you have SSD then more ram will reduce swapping if you use more than 1 program at a time lol. if you are an ipad user and rock 1 app at a time, duh no. you can monitor your ram/swap usage.
also vmware - which can rock OSX - loves that extra ram. makes you feel no pain
Would going to 12gb give me any noticeable performance increase?