I find it more readable personally, and definitely easier to write, if there are fewer parentheses at the end of the block. Also, the lack of indentation keeps things lined up nicely, without spilling them off the right edge of the screen.
But really, the block macro defines context (in fact, I considered calling it "context"). That is the semantic meaning. It gives you a list of expressions that define the context for the rest of the list.
I personally find it easier to read, but I am curious about whether other people do, and why or why not. You said the details of 'repeat don't look special anymore. Do you think they should?
