I don't have anything that I don't use. I have some things that I cuss at when I use them, but I use all of it. The wilton fondant ribbon cutter/embosser is a pretty miserable POS but I still find myself using it a lot. I just have to tighten the screw after every few rolls or it will unscrew. The fondant cutout/pattern press thing is good for making lace "clothes" for a naughty cake. My kids like to play with it too.
I had a pasta machine already, for making pasta. I don't have good luck putting fondant through it. I can roll bubble gum thin with it though, and make roses out of that. If anyone's looking for a pasta machine, I keep seeing them at Ross for $14.99. It's a lot more trouble than a rolling pin, to me.
Oh, and character pans...when I was pregnant with my first daughter and very emotional, I was at my mom's house trying to make a cake that looked like my dad's volvo station wagon, from a Wilton pickup truck pan. I don't remember exactly what set me off (actually, I believe it was torting the cake so it could have a hidden coconut pecan icing layer, and then frosting the wrong side, but we won't talk about that) but I opened the front door and chucked the cake out, along with the pan, howling in rage and frustration...and that pretty much sums up how I feel about character pans.