Four of my druids had no BoA +experience gear initially.
I added the first piece in Terrokar to these toons.
And the second piece has been added late into the Nagrand quests.
They are 69th, and about to hit Blade's Edge Mountains.

The other druid had two pieces of the +experience BoA gear right from the start.
She has just dinged 72nd, having only run Hellfire, Zangarmarsh, Terrokar and Nagrand.

Granted the team has played every minute with rested since RAF ended.
But I much prefer the BC quests to the WotLK collections...
I'm pretty amazed at hitting 72nd off of four BC zones.
I might actually stay in BC until 71 or 72 on the other toons.
Chances are Northrend will be faster... but its also about fun, and non-collection BC quests are more fun then needing some collections in Northrend, to open non-collections, which open collections, etc.