I have improved a lot since joining. I express myself more clearly and with more thought as to the poor person trying to read my sentences. I find that I have to edit my work less, because it tends to be more often right first time.
As regards "internet writing" which is different to offline writing, and putting articles together - I have also improved. But instead of taking less time to create something I now take more time to create something better.
An article is forever. Each article you write is against your name. Therefore I believe it is worth making each one the best you can do.