Using context is quite different from people not seeing alternate points of view. If someone is interested in LGBT issues, it's more likely that the "Pride Weekend" is what they might be interested in, especially if the search originated in San Francisco.

If someone is mostly interested in philosophy or psychology, that, and they see articles which they are mostly interested, the fact that "Pride Weekend" might be a bit lower down in the ten natural search results doesn't mean that some abstract "alternate point of view" has been excluded from their world view.

I suspect people use the term "Google Bubble" mostly as an abstract FUD, as opposed to anything that they can definitively point to. This kind of context-aware searching is something they can "point with alarm" about, but it's actually a good thing, not a bad thing.