My experience of woodies is extremely limited *fnarr* but I think I'd have to say Troy (TROY!) I just had so much fun on it, it was fabulous. I'm gutted I was aching so much at Efteling *glares at Toverland's high ropes course* as I get the feeling Joris & Draak could be equally fun, but I was just in too much pain to enjoy them.
I'm glad Jordan mentioned Grand National, because I always forget it when it comes to this kind of thing, yet I absolutely adore it. Again, it's fun from start to finish, and the racing element really does add to the experience.
Of course, PBB's Wild Mouse gets an honourable mention. It's kind of in a different category to other woddies, but I do love it. The whole thing is so ridiculous, it's amazing. I really couldn't imagine ever visiting the park without riding it (of which the same can't be said of Dipper or NickStreak)
I really need to get on some of the more highly rated woodies. See what all the fuss is about.