I recently re-read it as well and had the exact same thought. After reading Grapes of Wrath for the first time since high school a number of years ago and thoroughly enjoying it I started working my way through many of the classics and you couldn’t be more right. Finished Moby a few months back and thoroughly enjoyed it.I'm reading Moby Dick for . . . the fifth time maybe. I remember thoroughly enjoying it the first time read it in the eighth or maybe ninth grade. It was a fascinating tale for required reading. Then my teacher ruined it for me for years. She insisted on dissecting it and finding all sorts of nonsensical meanings in the words. I wonder what it is about great, enjoyable yarns that drives teachers and critics to destroy an author's work and take the joy from it?
Just an idle thought.
The classroom over-analysis I believe does more harm than good not just for the novel, but for reading in general. Makes you wonder what the authors would think. Can’t help but think it would be met with either laughter or tears, maybe both.