I also could go on for ever on this subject. I am still passionate about children's books, though I'm not very up to date. Very glad to hear dislike of Harry Potter. I did try, and gave up from sheer boredom and irritation very quickly. I think I would have disliked them when I was a child, too.
My all-time favourite book was What Katy Did by Susan Coolidge - characters that leap from the page, humanity laced with strong morality. I was ill a lot as a child, and identified with Katy's trials, and how she learnt to cope. What Katy Did at School came in the same volume, and I loved that just as much. I've still got the copy I was given when I was ten, very battered.
Hans Andersen, a quirky genius.
Winnie-the-Pooh I still go back to - I've read it in German and Latin as well

. The Disney version enrages me, as do his Alice, Peter Pan and everything else.
Little Grey Rabbit by Alison Uttley.
Noel Streatfeild - again, lively characters, real humanity (though sometimes rather dodgy punctuation).
Eve Garnett, The Family from One-End Street.
Just William, all of the books
The Secret Garden.
E. Nesbit, though I came to those rather late.
I always disliked Enid Blyton, except for her books on nature. This made me a bit of an odd one out at school, but I stuck to my dislike and didn't join the crowd. I also disliked my brother's favourite, Arthur Ransome - poor characterisation - and I didn't like Little Women.
My children loved Moomins, Roald Dahl, and one of them had a passion for the Narnia books, which I didn't share. The other one loved Little Grey Rabbit so much that I eventually knew the books by heart, as I did quite a few Beatrix Potter books. (I can still recite Peter Rabbit.)
Sorry this is all a bit disjointed. I'm very tired, for reasons that may eventually appear on the Grumpy Rant board.
(Just seen mention of the Orlando books - yes! I've had two marmalade cats called Orlando.)