Not sitting at the table for an extra 5-10 minutes while my opponent tanks to choose between many losing options and no winning options is a gain to me.
Only in a long team match and only if I know the opponents and if the score is not close. If the score is REALLY not close, I might not need to know the opponents, but only if I judge them not to take offense.
I can't say I've ever done anything like this. I'd just bid 6♠. I thought about 5♦ exclusion, and I think partner should figure out exactly what happened, but as jdonn says, it's sort of nice if the opponents have no clue what's going on.