Manzi, who founded a company that makes software expediting RFTs, is an enthusiast of this empirical approach, and rightly so.
That was 30 years ago, when I was something of an enthusiast.
One Miku enthusiast might compose an original song for her using Vocaloid, for example, and then upload it for others to hear.
1560s, pejorative, "one who believes himself possessed of divine revelations or special communication from God," from Greek enthousiastes "a person inspired," from enthousiazein (see enthusiasm). General sense (not always entirely pejorative) is from mid-18c.