I would say that the most useful thing about those cross references is that just by looking at the reference under a conditional instruction ( xic, xio, neq, etc ), you can see if there is a destructive instruction for that address or tag ( ote, otl, otu, etc). Its a very quick and effective way of making sure you didint forget anything... and cross referencing each tag using CTRL+E woud be very time consuming for the size project I do...