Consumption makes more sense when viewed in the aggregate of society. A corkscrew industry presupposes the social need for not only producing, but reproducing corkscrews on a regular basis, depending on the rate of consumption. Corkscrews have a limited lifespan due to corrosion, dulling, breaking apart, being lost, etc. which results in some definite number of corkscrews needing to be produced regularly for replacement, in addition to first-time consumers. In this view, you can think of consumption occurring piecemeal each time a corkscrew is used, just like a machine is used up a little bit each time it is used before eventually needing to be replaced.

I agree with your point on fungibility, although I think it is more accurately termed commensurability. At least, the latter is the term Marx uses. All commodities are fungible, meaning a commodity of type A is interchangeable with another commodity A. They are indistinguishable as instances of the same commodity. However, different use-values are of different quality as use-values and therefore incommensurate, not directly able to be compared quantitatively without a "third thing" common to both. They are different as use-value and the same as value.

When I say use-value is a boolean, I'm talking about one step up in abstraction. A commodity is "a" use-value, and its use value is its physical characteristics which are sought for consumption. Although commodities A and B are different use-values, they are both the same in that they are use-values, and therefore can be exchanged.