1st response is it's a personal decision. Everyone's take is different..
2nd response to answer your question from my viewpoint, YES!!! It truly makes a difference for me. I only use 13" handles on 72" sails.
While I don't personally subscribe to it, some of the better indoor and low wind fliers use 15's, 17's or even longer handles.
Personal recommendation, Have a look at the Freilein Handles. A simple change of the leaders and you have a great set of handles. With the typical Rev handles, you'll eventually want to convert to snagless. That's already done for the Freilein ones.