I use pretty much everything except my pasta machine - probably because it's put "up". I tend to use things if they are easily accessible. I don't use my bread machine much but I should. I need to re-organize and have things more handy. That's my biggest problem in not using my gadgets and appliances.
I love my panini grill, Kitchen Aid (especially the meat grinder - it makes great gazpacho), I am glad I have a stick blender, I love the rotisserie too.
I can't live without my mandolin, santoku knife, food processor and those other standard small appliances.
As far as "gadgets" the most useless one is the little orange thing that helps you peel oranges and the spout thing you can push down in one that when you squeeze the orange the juice is actually supposed to come out of the spout - well it comes out all around it too!
I don't have a garlic press - A good whack and chopping with a knife works for me.
If you ever feel like you need a mini-processor/chopper realize that cheap isn't always good. I bought a 2 or 3-cup size that is perfect for those smaller jobs but the motor just isn't powerful enough. So.....that one will go to somebody or Goodwill. You may not want to pay $30 - $40 but I guarantee it will be worth it!
I'm sure I'll think of more
Alix - those smoothie makers REALLY do a great job. Better than a very expensive blender in getting all the ice chopped up so it's smooth and doesn't have those annoying ice chunks in them.