you can't tell who you shared your posts with
This is not actually true. First of all, you choose who to share with. Unless you posted something as 'public' you do have an idea of who you are sharing with. On the post itself (again, unless you posted something as public) you can click on the little link that says 'limited' and it will show you who it was shared with. If you are concerned about people RE-sharing your post, then you can disable resharing on a post as well. Naturally there is always a way for people to republish what you posted, manually, with good old copy/paste, to get around these controls, but why would you have people like this in your circles of trust to begin with?
I still can't figure out how to post on someone's wall.
there is no wall. If you want to share a post with one person, then you specify that one person while you are creating your post.
the circles are way too hard to set up
Really? Dragging and dropping in a visual interface is 'too hard'? What did you expect? That it read your mind?
P.S. If you're just trolling, it's kind of obvious.