Diagramming sentences was an epiphany for me in grade school. I have a distinct recollection of the time when diagramming was first explained to me, and my thinking to myself, "Oh, so this is what they've been trying to teach us about grammar!" Today I'm totally confounded as to why this teaching tool is no longer used! Is it possible that the portion of students like me (who think graphically) is so small that they can be ignored? The following quote from this book explains my feelings about diagraming perfectly:"Diagramming made language seem friendly, like a dog who doesn't bark, but, instead, trots over to greet you, wagging its tail."
This book takes me back to my one-room rural grade school days when things made sense. As you can see, I get a warm and fuzzy feeling when reminiscing about diagramming sentences.