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Using WSYWIG tools it is easy to give the format too much power. - my categories are for the general text producer, not the poster-designer (for example). OverPower1 is to spend more time tweaking the format than the words. OverPower2 is to edit the text in order to make the line breaks look neat.
If you see only text when typing you will have little exposure to either fault. TeX and progeny are great for some. For me, text in TextWrangler (a terrific, beer-free Mac text editor) and output in InDesign. (InDesign is eye-wateringly expensive if it doesn't make you money. My excuse for this luxury software is that version 1 was cheapů)
Implementation details are (for me) secondary to the primacy of the words, however they are produced. Hey I'll even use Word if need be: am currently being paid to tame a couple of 300-page Word messes. Thank goodness for OpenOffice to revive broken documents. And VBA to repeat the corrections.