Sheakespeare is like that for me. I have always (ever since I picked up my first Shakespearian play, Romeo & Juliet) enjoyed reading Shakespeare, but at the same time he's never been an easy read for me.
More traditional poetry is also like this for me. I read Sir Walter Scott's The Lady of the Lake when I was 19 and while I enjoyed the ebb and flow of the words there were aspects of the epic poem that I just didn't get. I'm much better with the simple poems.
As a child my favorite was Vachel Lindsay's The Moon's The North Wind's Cooky. Which to this day I still love and often recite for my daughter. One day I hope to have the opportunity to study poetry, perhaps with my book club (it was discussed as an option during our last meeting). But for now, here's a simple children's poem I discovered a few months back (Accrossthepage) about one of my favorite places:
No need even
To take out
A book: only
Dry breath of
Ink and paper,
Or stand and
Listen to the
Of a billion
[Library From All the Small Poems and Fourteen More (New York: Farrar, Straus & Giroux, 1994)]