Very concise and informative analysis of Hitchcock’s use of suspense. Many directors and writers today would benefit from reading your essay.

It’s certainly that Hitchcock was a (the) master of suspense, but his greatness as a filmmaker resulted from how he used suspense as a part storytelling.

(Spoiler) In the 1936 film Sabotage, the villain plants a bomb in a package carried by a young boy. The boy doesn’t know about the bomb, so all of his actions (e.g. playing with a cute dog on the bus) generate suspense in the way you describe (audience wants to shout out a warning to the boy). The bomb goes off, killing the boy and other passengers and adding surprise / shock to the suspense. But years later, Hitchcock explained that the scene didn’t work because of the sympathy for the boy that the scene had created:

Shocking an audience was easy; you could show a group of people at a table playing cards and suddenly have an explosion, killing everyone. Much more effective is to show the same group playing cards but also show a time bomb placed under the table, knowing that it might explode any second. This approach is decidedly more suspenseful by engaging the audiences’ fear for the potential victims. Yet, in Sabotage, Hitchcock stepped over that line into shock when [Spoiler Alert] he had the bomb explode, killing the young boy along with other bus passengers and an adorable dog (a complete taboo in England where canines are the favored pet). Audiences and critics alike felt Hitchcock went too far this time and even the director agreed in retrospect when he was interviewed years later by French director Francois Truffaut: “I made a serious mistake in having the little boy carry the bomb…[He] was involved in a situation that got him too much sympathy from the audience, so that when the bomb exploded and he was killed, the public was resentful. The way to handle it would have been for Homolka [the villain and husband to the boy’s sister] to kill the boy deliberately, but without showing that on the screen, and then for the wife to avenge her young brother by killing Homolka.”
Source: http://www.tcm.com/this-month/article/78365%7C0/Sabotage.html

Suspense (and surprise) are just two of the many tactics Hitchcock used in pursuing his larger goal of engaging the audience. It’s how he orchestrates all these tactics that elevates him over other masters of suspense.