The camel souk was the only thing we really enjoyed in Al Ain and I'm glad we hired a car in Abu Dhabi to come and see it. I guess we could have taken a bus tour, but then we would have been with the big group that must have spent all of around five minutes there.
If you're somebody who enjoys taking photographs, it's worth spending a little more than an hour there. The traders will have more than gotten used to you being there by then and will have stopped offering to show you their baby camels (for a fee, of course).
Common advice for visiting the camel souk seems to be to dress respectfully. The blonde girl in the strappy top and hot-pants gripping her partners hand appears not to have read anything about that, but she was in amongst the sea of 5-minute tourists, so I don't think she noticed the reactions. I don't know whether our more modest dress was what led to more interesting conversations with traders, but I expect it could have helped.