Double-spacing after sentences vs. Single-spacing

I was always taught to type two spaces after a period.  Perhaps this was because when I learned how to type, I learned on a typewriter not a computer.

I never knew there was a debate on this until today.

http://en.wikipedia.org/wiki/Double_spacing_at_the_end_of_sentences

Apparently it is wrong to use double-spaces after periods because computers can now properly space letters and sentences.  But, I fear that it has been a habit of over twenty years that I will not be able to break the habit.  Anyway, I think it is easier to read when there are double-spaces.  No one is grading my grammar anymore, so who cares?