why they're really up in arms (Score 3, Insightful)

I think the key here is that the typical use pattern for academic works is different than for works intended for the general public. Frequently the reader of an academic journal is interested only in a specific fact, and they will often be able to glean this fact from the small amount of context provided in the Google search results. This threatens the revenue model of academic journal publishers, which is a form of bundling, namely, charging the university libraries for the whole journal or for several related journals put out by the same publisher.