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.
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.
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.