I've never met a pastor who hasn't benefitted from knowing the languages.
From my perspective, I'm a fan of the "tools" approach to languages at the basic MDiv level. Equip people for minsitry by requiring two years of Greek and one of Hebrew, teaching them the foundations of the languages (grammar, syntax, vocab, etc) and then also show them the tools they can use and how to appropriately apply what they know to study.
Though a pastor is not disqualified for not knowing the languages, they are certainly made better. We aren't to be novices at this thing. While I make it a hard and fast rule that scholars and (specifically) OT/NT profs know the original languages, it isn't so for pastors. Of course, I have yet to hear a convincing argument as to why a pastor is better off not knowing the languages.
With so many (mostly) free resources on the internet and available within moments around us there is little reason to consider why one doesn't get more prepared for ministry by working on the languages.