So yeah, those people would be inconvenienced by having to walk a few more blocks, but way, way more people would experience greater convenience by having faster commutes along those very busy lines since they wouldn't need to make such close stops.
There's a happy medium between too many stops and too few. Two stops within a quarter of a mile is way too many. You can imagine a subway system in which a north/south line stopped at literally every block; you'd probably still have more than a thousand daily riders at every stop, but that's no argument to keep every single one of those stops (or even worse, build them). The system performance would be terrible and it'd take forever to get anywhere. The same is still true when you have stops that are only four short blocks away from each other.
