I had a lot of trouble with threshold. Couldn't get from the first bridge to the second even after getting all 5 glowing pieces available up to that point and I probably tried a dozen times.
However... if you have the white robe it becomes super easy so there is definitely a difference. In fact, once I had the white robe I only got the two glowing pieces in the hub and didn't bother with the 3 in the bridge level. You can actually jump from the ledge at the beginning to the first platform, regenerate, and jump to the second with only 2 glowing pieces collected! Then repeat for the next sections. There were a couple that were pretty tight but it still worked out, and I did it on the first try. Bam, level complete and trophy earned in about a minute.
Currently working on: Rayman Legends
Platinums (21): 3D Dot Game Heroes, de Blob 2, FF XIII, FF XIII-2, inFAMOUS, LittleBigPlanet, LittleBigPlanet 2, Medieval Moves, ModNation Racers, PlayStation All-Stars Battle Royale, Racquet Sports, Ratchet & Clank Future: A Crack in Time, Rayman Origins, Sly 1, Sly 2, Sly 3, Sports Champions, Sports Champions 2, Tiger Woods PGA Tour Golf 12: The Masters, Trine 2, WipEout HD