Double jump is good at getting out of dodge quick and avoiding enemy fire. Lift and glide are capable of this with more effort though. Invis is great in pve. It allows you to sneak past and take out annoying majors with ease using a shotgun. I have saved many a run in PoE by going invis getting to the special target and taking it out before stealthing my way around the map to revive my fireteam. I can be a lot riskier and survive on my hunter than I can my warlock.