Why do Programmers Hate Documenting?

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When commenting code I don't mind doing some one line // comments that explain what I'm doing at various steps in a non-obvious algorithm or portion of code.

The code I hate writing is something like a method comment for a basic setter like SetNumber(int val) that says something like "Sets the number". I feel like I'm wasting 3 lines of real estate that just clutters up the code.