I've had the same yahoo account for over a decade and the old interface made it extremely labor intensive to clean out the clutter. As much as I hate the clunky new interface, at least it can meaningfully sort on sender names. I've deleted 15,000 e-mails this week. I'm down to the final 1,000 and it feels good, good, good. 
It's the little things in life...
It's the little things in life...