According to the wiki, they are still possible, just harder to make - so how do you make one? Also, is it possible/easy to convert the existing ladders, or do you have to rebuild it completely?
Apparently they still work, but are slower and more difficult to build.
Here is a tutorial for 1.5 (at about 2:00 it talks about pre 1.5 water ladders and how to make them work again)
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