Error bars are often used on graphs to show statistical comparisons.
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The inventor of the Pie Chart was not Florence Nightingale. The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801, where two such graphs are used according to WikiPedia
Most graphs: Pie charts, bar graphs, histograms, scatter graphs can all be used.
Line graphs are often more clear to analyze, and are used for continuous data. bar graphs are used for just a certain amount of results, ones that don't continue.
Bar graphs are usually used for comparing. You could go into more detail, but that's the gist of it..
Actually, they are useful. At least in some cases.