I use Bijiplates at the moment, but holy god it goes nuts near the end of WotW. The game become virtually unplayable for me during the last minute or two of the adventure since there's just so many units and frames on screen, my computer locks up for seconds at a time. Thankfully unless people are diving into the middle of the pack and pulling aggro then it's not really a danger.
Did you update the addon and try the option in the bijiplates menu "WotW Temporary Fix"? I didn't know about that option when I ran it a few times, I have it enabled now but haven't tested it yet. A buddy of mine says it worked for him though.