void elf teleport actually has many very useful applications but requires a lot of patience and understanding of the mental game. otherwise it's just a slow and predictable movement option. as someone who's been playing it for a a couple months now at least I can say it's one of the most rewarding races to play and has netted me a lot of unexpected advantages.
the juking potential is obvious, you can use it to get a cast off and then tele behind someone before they can cast back at you and cancel their cast, you can use it to get deep back line cc and escape, and a bunch of other cool stuff especially in conjunction with your class's core abilities like priest fear or hunter disengage.
getting a good grip on when, how, and why you should use it takes some time. it's not the best race in the game by any means but a creative and situationally aware player will get waaaay more value out of it than someone who tries it out for a few minutes or has less experience.
not saying anything about you specifically btw just a general statement for people considering playing this race. at 19 Dark Iron is probably the best atm and will likely be surpassed by Zandalari but velf is always a fun and rewarding choice if u give it time.