The Mermaid ride was outdated the day it opened. We rode it maybe 6 times in September because my 1 year old LOVED it, and the more I rode it the more I hated how cheap it seemed. The Ariel AA is straight up terrifying. For those 6 rides I bet we waited a total of 10 minutes. Granted, September, but still.
The one time I rode it was in February a couple of years back during one of the busy weeks. Most of the MK rides had 60+ minute waits. Little Mermaid had a posted wait of 30 minutes, but I couldn't see anyone in the queue and I wanted to check it out so I went ahead. There was no wait. I just walked through the queue and got on the ride.