We noticed the new no-left sign and at first went straight, and did a U-ish loop around the temp farmer's market tent to eventually go south on Jarvis. But seeing how nobody else was following it, we just ignore it too.
IIRC, there was a time where there was a dedicated left turn lane, just now with the recent changes it's all bogged down and blocking the few that want to go straight or right.
Perhaps what they need to do is have an advanced left-turn green? They definitely need to rethink how to properly handle congestion in that intersection though.