Instance boosting is still quicker than questing even without RAF but it is soooo boring. I'm boosting a team of paladins and it's taken about 17-18 hours to get them to lvl 37 (quested them to lvl 10), each SM Cath run at lvl 25 got them about half a level, now gets them about 24%. But you can do 5 clears of that in under half an hour = 24-25 mins per lvl.