Teaser - Sub-query "Lineage Lines"
In a tool that's all about creating sub-aggregations & re-aggregations (or slicing and dicing) of tables - it can be pretty important to understand how all the queries are related (if at all).
If it's a polished dashboard you are pushing out to users, this is probably quite not as important (you likely have this all figured out), but if you are still developing it - or, better yet, just exploring a new dataset - I find this super helpful.
In particular if you are add a new filter or changing a parent query in some way, you can turn the lines on and immediately see all the possibly downstream effects of the change.