We stayed at WL CL last year in May with our then-18 month old. We loved having the CL. We found many of the selections to be very kid friendly. We stayed 5 nights and did all but 1 breakfast and 1 dinner in the lounge. It was such a relaxing place to sit and eat. The lounge was never crowded. There is a really nice toddler splash area at the pool that our son really enjoyed. He also loved the boat ride to/from the MK. Also, we requested and received a room which faced the MK, so my DH and I could see the fireworks after he went to bed.
We will be going back in October, the week before our son turns 3 and we will be staying at the Poly. I debated booking WL CL again, but we got a discount for the Poly and decided to give it a go. I really did love WL CL though and highly recommend it!