In reply to Heddwyn:
I'd think with good weather there would be quite a few people there but it's a big potentially confusing place so you are taking a gamble - especially as it is predominantly multipitch so you could find yourself lost half way up a cliff!
I'd think you'd be very unlucky to find all HS and below jammed, but would encounter other parties on these routes - but that's good cos then they could tell you where to go eh?
You should be able to find Left Hand Route and Right Hand Route on North Wall easily enough, but things like Central Rib Route and Zelda take a bit of finding - especially the start of Central Rib Route.
Good luck!