Yeah, I've been asked for my ID loads of times as well
As for campsites, some are much better than others. I didn't like the Top 10 sites, they were just too organised for me, there were far too many rules. They felt like HiDeHi or something, I felt like someone was watching me from behind manicured bushes to make sure I was behaving. They have all the facilities but it depends what you want I suppose.