I disagree; there are far too many non-melee DDs who are boss LB happy. If there's a melee DD, let him use it on the first boss.
Iff he doesn't, then use it yourself on the next big trash pull immediately after the tank's AoE hate move. This should save more time than using a weak LB on the first boss.
However, if you let this first AoE opportunity pass, then leave it alone. Once that first group is dead, any limit break by any DD before a 2-bar on the last boss will likely be a time loss.