>I'm sure it has been mentioned before but wouldn't it be easier to just build temporary wooden coralls .<

Yes, it would have been easier to have built temporary wooden corrals but why build a temporary corral when you could build one that's going to last more than a couple of years?

I'd use the analogy of concrete posts with 'slot-in' wooden panels between each post. In the Stone Corral scenario there are permanent stone posts with walls or fencing between them (the organic fencing being replaced as it wears out - just like a modern fence). The initial labour of getting stones into place is going to be more than felling trees to do the same job but it is a sensible way of building a corral if you're planning to stick around for a generation or two. And actually, if you think about it, you might be in an area where suitable post stones are literally lying around and just waiting to be hauled into position; the sarsen erratics at Lockeridge Dene and Piggledene near Avebury are examples of such easily harvested stone.*

* http://www.visitkennet.co.uk/things_to_do/