I never thought of reading it (Huh, bunnies! it's a kid's book) until I read The Stand by Stephen King. He rambles on about going tharn and I thought "ok, I'll try that".Just started a reread Watership Down ahead of the new series adaptation. I read it when I was 11 so my memory of is a bit fuzzy in places. It's wonderfully written though, it grabs you right from the start.
As you say - it grabs you