From what I experienced in the beta, your movement ability centers on how you engage combat, and what angle you believe will allow you to get the upper hand on the enemy. I play the Warlock, and using glide really allows for a wider range of movement in the air compared to the Hunter and Titan in my opinion. Compared to the Hunters double jump I would imagine that it would feel sluggish and maybe even slightly dull in pacing. However in the crucible the ability of gliding allowed me the time to assess where my enemy was attacking from and how I could attack or escape to engage again from a better position. It really forces you to use the environment to your advantage and be creative with kills.