I think anything is worth seeing once. However, as a FL resident, if I want to see a gator, I just check the retention pond behind Wendy's
Honestly, for real nature experiences, I take the air boat tours. Air boats are just a brick ton of fun and you get to see gators in their natural environment (vs. the retention pond at Wendy's) and yes, you get REALLY close. Check them out. They're all about the same, but some give more time for the money.