My dps toon never used it but my healer of 4weeks used it daily and never queued longer than 3 minutes. Sadly since DB ive yet to get into a group with countless efforts of up to 1hr + . Sad they couldn't test/fix this before pushing it live.
Just had 3 random dungeon run now from AF, waited for 1min for each. Queud as DPS, surpassingly not much lag in the dungeons this time also. Thought they just fixed it, here's hoping. Although queued all day earlier eith not success.