In general, for daily riding, you ride a gaited horse like you ride any good horse (sit balanced with a strong seat). The hand can be a variant, as most gaited horses more better when ridden in contact. Some do OK on a loose rein but they are the clear minority.
Every gaited horse has a "native" way of going for them where they will balance smoothness against the energy they have expend to maintain that gait. This gait can diagonal or lateral, fast or slow, or flashy or mundane. This is going to be that horse's gait for "everyday" stuff. It's often, but not at all universally, what they do at liberty.
The problems begin when the human in saddle or on the ground decides that the horse's native way of going is "incorrect" and set out to "fix" it. The show ring is the most common place where this happens, but not the only place. Avoid the show ring and you avoid a lot of problems.
It also becomes a problem where the breed is based upon a certain way of going. Not all Walkers do a running walk (as not all Foxtrotters foxtrot and not all Racking Horses rack, etc.). Now, to make them comply with an arbitrary standard, we begin to force the horse into a frame/way of going that is not native to them. A little bit of this won't really do any harm if done carefully and thoughtfully. But we have multiple examples where care and thought are not really part of the process. And trainers who think "if one is good, two must be better and three is outstanding."
All of this is a long way of saying that DVDs of "gaited horse riding techniques" are not really required to effectively ride the average gaited horse. Having a good seat, good hands, effective use of legs, and overall good riding skill is necessary. That generally means time in saddle intelligently used. I've never mastered the art of riding a DVD!