Lately, I've been using orange zest in several recipes, including some breads. For a citrus zester, sometimes I use my microplane, but my fave is a Titan swivel peeler with micro-serrated blades. I can peel off the zest in one piece from an orange. Then I dry the zest and grind it in a dedicated coffee grinder. Way cheaper than store bought.
Regarding coffeemakers. My friend recently acquired a Keurig. I know some people love 'em, but I have some philosophical and practical problems with them. Number one is the amount of waste they produce; even the inventor said he's sorry for inventing it for that reason. Two, both the machine and supplies take up a lot of space. Three, it's expensive for the amount of coffee per cartridge.
Regarding spiral cutters. I have two different kinds. One is a blade with a hole on one end for your finger, and the other end has a plastic screw. The other is a crank type that operates like a wood lathe.
Regarding apple corers: sometimes I use the same kind of corer you have, sometimes I just use a paring knife and quickly cut a cone around the stem and blossom end, and then either slice the apple in half and use a butter baller to remove the seeds or cut it into quarters and use a paring knife to cut out the seed core.
One exclusively single-use tool I have is a pineapple peeler and corer. Even so, sometimes I just use a chef's or boning knife.
FWIW, we had a memorable Chateaubriand for Two in Zermatt on our honeymoon. It's our favorite wine.
