My turn, there's something I want to say.
YES, I'm one of those "immersion nerds" all this thread (and reddit one) is criticizing. YES, "instant teleport across the entire galaxy" sounds even stupid in my head as it collides with one of the pillars of the game: the scale is insanely big, can go wherever you want in the galaxy, and as for that, long trips take it's time to be done. Not for nothing this aspect of the game has it's own mechanic: exploration. If suddenly you can instant teleport anywhere then nothing is "far away" anymore. So YES it is for me game breaker.
BUT,
Is there now a time wasting problem when meeting friends in-game? Definitively YES. I've myself sometimes dismissed playing with friends because we were too far away from each other and had little time to spend playing.
Is this new feature a good solution? I would say no. Multiship wing would still have the problem as you cannot teleport your ship but only yourself. And teleport from anywhere anytime is still nonsense.
Solutions to "how to":
-easy way, within the same station;
-outside station: deploy yourself in a SLF and dock inside your friend's ship. Same with SRV if on planet surface. Order your mothership npc pilot to follow you so you can wing or later dock back and follow your path (without another magic back teleport).
Solutions to "too far away each other":
-instant: you could control one of your friend's already npc crew. Still a bit of magic but has more sense. Downside: no personal grind/rank. Hint: also for instant pewpew fun we still have CQC, which could see added multicrew.
-not so instant: begin with friend's npc control and order a station to bring one of your ships. Once it arrives your friend docks at that station and you can switch to actual own CMDR/avatar multicrew. A bit of a dirt trick because technically now it's only ship sending but would be acceptable IMO. Winside: personal grind/rank and own avatar (from new cmdr creator), and could add your ship to the wing (npc piloted).
-obviously also actual manual flight to meeting point: maximum immersion hysteria.
What about explorers far from stations:
-only npc crew control (if not any at all). Why this is important: people complains that we need new complex/deep mechanics (absolutely TRUE), but many of them don't know all the existing ones. Exploration is important for two reasons: 1) it involves mechanics otherwise you would not use (serious plot routing, long term ship managing in the wild, scanning/discovering, etc), and 2) it gives you access to content otherwise you would not see: specific locations visiting as real nebulae, black holes, Jacques station, Beagle Point, Formidine Rift, Colonia, ruins, mystery puzzles, etc. If we can now teleport from anywhere to anywhere at anytime instantly, exploration could be discarded by many players. It could be a "casual easy mode" of accessing that content. Not everyone has to love exploration (many are only fighters or traders), but if there is some problem about its mechanics, that has to be solved not discarded. Frontier should encourage people to learn exploration (as well as Powerplay and BGS) by fun content/mechanics, and this new feature does the complete opposite.
And HELL YES, actual CMDR/avatar multicrew exploration would we a total win: distributing tasks, one player is let on a moon SRV collecting needed materials while other pilot does the system scanning ("I'll be back in 10 minutes", flies away); maybe asteroid minning one piloting/lasering and the other precise controlling limpets to speed up process, etc.