Yeah, I know it's not a bug and never claimed it was such. I know the design reasons and saw all the developments as they came, but it still eats my lunch. Honestly, I don't know if being able to travel the Y axis is really that much of a bonus, considering that there are a number of flying mobs around now, as well as snipers in places like PI. The other Travel powers aren't exactly aggro magnets, either. Superspeed gets you halfway across the map before any attacks might hit you from mob aggro, which is also suppressed anyway while SS is active, IIRC. The only real disadvantage is not being able to navigate different heights without jumping ability, but Ninja Run can take care of that, for the most part. Teleport and Superleap have similar ability to avoid mobs, especially after TP got the short-term Hover so you could do high altitude teleports. TP's top power actually takes you Zone to Zone, so I would hardly equate slightly faster flying with that as a top Pool power.
Actually, the best traveler I had took no movement powers. I just slotted Swift, Hurdle, and Sprint. Combined with Nina Run, he hit ust shy of SS run speed, and over 90 mph when Elude was on. Plus some almost Superleaping level jumping height.