There's also using the Palantir, and there's also summoning and army of the dead, then dismissing it once done. He wasn't necessarily a magical practitioner, but he had a certain magic about him because he's King.
Likewise, while Aragorn uses Athelas, his healing abilities are a callback to
Royal touch , the belief that kings had the special, miraculous ability to heal. And if you read closely in "The houses of healing", he doesn't just use herbs. He
calls both Faramir and Eowyn back, and they come to him because he's the king. Faramir says as much.