Sea World's monorail takes you over the quarantine pools on the eastern side of the main entrance (behind the ski boat docks) where you can see animals in rehabilitation. It's a stretch, but honestly - it's not efficient enough (it's neither fast, nor frequent) to be considered transportation. I've seen many people trek up the ramps to wait for the monorail only to trek it back down and walk back to the front gate because of how long between trips it is. I would argue that 90% of passengers riding do so for a place to sit down, and ride around for a few minutes in their day to get away from the crowd, and take the kids up high for the novelty of riding a monorail, whilst travelling at near walking pace around the park.
Going off Brads definition of seeing \ experiencing things you wouldn't if you'd walked - the tour of the train sheds, big brother backlot, blue lagoon sneak peak, rocky hollow lagoon, the aboriginal rock art behind billabong, the different perspective of the birdlife in the wildlife experience, the TOT drive sheds... there are still things you get to see on the train that you otherwise wouldn't. Likewise, the fact that it only does a circuit once every half hour and then sits at main street for 10-15 minutes, its not really ideal for a 'I don't feel like walking, let's hop the train'. it is not the most efficient method of getting to another part of the park - especially since it has such a roundabout circuit surrounding blue lagoon to get up the grade.
I'll say again - it can be both transport, and a ride, but its a stretch to consider almost any closed circuit attraction within a theme park as 'purely transport' unless it got you into or out of the park... I'm not arguing that these things aren't transport, just that they are rides \ attractions