Wasting time building up Fury will significantly lower your DPS, especially for mêlée classes.
All that time you could have been actually doing damage.
My burg can show up to Bugud with a third of his morale already gone from folks riding around him, and readily pull threat, despite having the -30% perceived threat mount trait. That's how little damage they do riding around, and how much more I do staying in place.
The best thing you can do is get the relics for -attack speed, trait to reduce skill CDs, forget Fury, and put the MOB on /follow...they made it a keyboard shortcut with Update 9 for a reason. ;-)
Remember, DPS is damage per second, it's not about doing more damage on a single attack, it's about having your average damage happen more frequently. A car analogy would be the winner of the race isn't the one who had the fastest top speed around the track, but the one who spent the least time at slower speeds.
Fury is a gimmick Turbine added because, as they said in one of the videos, mounted combat was boring with everyone just standing around on horses. However, the gimmick doesn't change the mechanics. Hopefully they won't re-balance it, as it can take three times as long dropping something while riding around.
"Sometimes survival comes down to not being hit. Actually, most times." -the chicken skill, Bob and Weave