Honestly, they should have a much leafier plants than bamboo blocking the backstage areas from view, and they should have these plants ready to be planted at the appropriate height, IMHO. No need for the whole area to be bamboo either, could be a mixture of plants, so if you lose one plant then you don't lose the whole section. Should be an earthen berm or rockwork anyway, its not that big of a stretch of track to put in some rock work or an old fashioned earthen mound, doesn't need to be high because the guests are sitting down anyway.
They could have easily brought in camo netting and some potted plants, really, there is no excuse. If this was Jungle Cruise in Disneyland and guests had to see the backstage area of Main Street (which is right next to the Jungle Cruise), there would be a line at City Hall.
Everybody sees this backstage area, it destroys the magic and demeans the guest in a way . . .