The gadgets that are essential and unusual since I went paleo/primal were the electric mandolin and a dehydrator. Jerky, home-made vegetable chips and nuts dehydrating are all very useful.
Other things I use a lot are Magic Bullet, hand blender and a garlic press.
Things I would not mind having but never got around to buying are salad spinner, the ribbon maker and a cast iron pan with grill barred thinggies on it (we have a fire pit, but no BBQ unit). And one can never imo have enough aprons & gloves!