Sorta but not really. If you model the grid as a superconductor, sure, but the transmission lines we use do have resistance and therefore a maximum capacity and

Sorta but not really. If you model the grid as a superconductor, sure, but the transmission lines we use do have resistance and therefore a maximum capacity and the father from generation you are, the more losses are incurred to get the power to you. So you end up actually getting power from the generating capacity close to you and occasionally get power from further away (or your local generation sends excess further than normal). If you have 2 buckets connected at the bottom by a small hose, and you take from the left bucket at a high enough rate, the buckets will be at an unequal level and at some point either you stop taking and the water eventually seeks its own level again or your take rate becomes that of the connecting hose. (this extension of your bucket analogy, like all water/electricity analogies, breaks in a lot of ways but it gets the idea across at least).