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It's correct. As an intransitive verb, the subject is the person feeling enthusiasm. "I'm enthused to be going to Disneyland!"

As a transitive verb, the subject is the thing causing enthusiasm. "Disneyland enthuses me!" (This formation does tend to be less common.)

Don't all verbs use have as the auxiliary in the present perfect tense? As such I am enthused would not be an intransitive verb, but either a nominal predicate or a passive verbal predicate. A correct intransitive form would be "I've enthused about going to Disneyland".

In the first case enthused should be replaced by enthusiastic, which is the correct adjective, in the second case you would use by rather than about as a preposition for the agent. Correct?

You'll just never find anyone using this verb in spoken English...

Yes, it's correct, at least my dictionary says so.