I use peelers mostly to get zest from citrus fruit, and I change them about once every couple of years.

I do not peel vegetables, as a rule, but then I've never cooked butternut squash. I scrub carrots and potatoes instead of peeling them. I do not peel zucchini or other similar squash. Onion and garlic skins do not require a peeler to remove. I sometimes peel the tough ends of asparagus and the stems of artichokes. I try to buy artichokes with the longest stems, and I used to grow them so that I could get long stems.

I do peel apples and other fruit, such as mangoes, white sapote (which I grow), dragon fruit (pitaya), etc. Dragon fruit does not require a peeler. A lot of fruit I do not peel, such as plums and similar fruit with thin skins. I very seldom buy peaches, but I do peel those.