Why don't you try actually learning it and then come back and tell everyone how easy it was 
Hardest part is the Cadenza near the beginning, and the running, one-handed doublenotes; identical in technical requirement to some of Roslavet's passages that Hamelin whines about being tough. The pianist who Ravel wrote this for (a famous concert pianist who premiered quite a few major works) refused to play it because it was too difficult. Ian Pace, you know, that guy who plays complete Finnissy, thinks it's tough.
Well, i am actually learning it, though not for a concert performance, which is why i don't plan to learn the final cadenza right now... I have been playing it for about a month, and have almost finished with the first solo... By the way, the first cadenza wasn't tough for me, though i do have quite a flexible left hand. And the running, one handed double notes you refer to, you're talking about the ones in the final cadenza, right?
Where did you read that about Wittgenstein? He sightread it the first time he saw it (With some difficulty i suppose) and the only reason he didn't want to play at first was because he didn't like it. He did take to it after a while, and in the end it became one of his signature pieces.
I quote from the Cambridge companion to Ravel:
It always takes me a while to grow into a difficult work. I suppose Ravel was disappointed, and I was sorry, but i had never learned to pretend (To like a piece he didn't like)
Only much later, after I'd studied it for months, did I become fascinated by it and realize what a great work it was. - Paul Wittgenstein
Topic: Sheet Music Request: Ravel's LH Piano Concerto