Yes, I do play him, I wouldn't comment if I didn't.
It would be cool if they could make her stats 'level up' when he puts a rank in her at level 12. I think she should have a lower CD across the board (120/110/100, which would reduce to 72/66/60 with 40% CDR), which would easily make up for living with the previous rank's cooldown.
It's worth it to me. The way I see it, you can either use the Maiden to splitpush or to teamfight, depending on which you place more agency in at the moment. While she's easily dealt with by a damaging champion, removing someone's presence from your team for a time to deal with her gives your team an advantage, and if they choose not to deal with her, she will deal large amounts of damage to towers, especially if placed in a growing, slow pushing minion wave.
I like the design of her being able to splitpush while Yorick does other things, and it's a strategy Riot actively promotes. It's a unique strength that Yorick has that makes him standout among other splitpushers, and among other champions in general.