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I experienced the same thing. I think moving 'also' like this makes it more clear:

If you spend a lot of your time coding, you are preferring an activity that others _also_ can do to something that only you can do.

still not clear. Do I have to read the article to understand it ?

Even better if you move it one word further?

If you spend a lot of your time coding, you are preferring an activity that others can _also_ do to something that only you can do.

Or maybe just change the whole phrasing:

If you spend a lot of your time coding, you are preferring an activity that someone else could do to one which only you can do.

Thank you for your suggestions. I actually adopted your last one, see http://tombartel.de/2016/07/05/recalibrate-your-productivity...

It's the word 'also.' Its position at the start of the clause sets up the expectation that the activity also does something, rather than others.

You are right, that sentence was hard to parse. I changed it. Thanks for mentioning it.

Others can do the work but also only a manager can write.

That greatly depends on what kinds of things you code.