Dijkstra once said that "The question of whether machines can think is about as interesting as that of whether submarines can swim."

I think I understand his meaning. He wasn't claiming that machines cannot think, but that one must be clear on what one means by "thinking" and "swimming" in statements of that sort. I used to work on autonomous submarines, and "swimming" was the verb we casually used to describe autonomous powered movement under water. There are even some biomimetic machines that really move like fish, squids, jellyfish, etc. Not the ones that I worked on, but still.

For me, if it's legitimate to say that these devices swim, it's not out of line to say that a computer thinks, even in a non-AI context, e.g.: "The application still thinks the authentication server is online."