I was wondering why this is not available on the rift? I think this would be an excellent addition ...
The rule of thumb for alternate map items is they'd be OP in Rift.
There purpose, more often than not, is to help out an archetype that's struggling in the alternate map modes.
For Twisted Treelines and Dominion, the maps favor 1v1 duels and skirmishes considerably more than 5v5 team-fights and sieges. As such, fighters and assassins, and mid-game champions, where totally wrecking face - and poor 1v1/solid 5v5 champions like mages and marskman, often late-game, where being completly destroyed.
Hence:

Wogglet's pushes late-game champion power-spikes significantly forward by offering a
+
power spike in one go,
allows marksman to transition smoothly into IE without needing the 15 minute weak-point to offset their safe farming in Rift, and
was just flat out the most broken thing ever, and
allows otherwise semi-tanky, ~
reliant mages to be more relevant sooner.
For Howling abyss, it's no mystery melee champions start at a pretty big dissadvantage, and poke is very dominant for the first half of the game. As such, there's 2 pretty solid regen/anti-poke items avalible that allow melee to circumvent this problem. Or even a few ranged toons that can afford to invest a bit in anti-poke defenses.