[mundacho]

Another simpler way (even simpler than macros) that works great for simple mass editing is visual blocks. In normal mode, press Ctrl + V and you get to select a literal block of text (not like visual mode, where the text is sequential). Then you can for example, do a "c" to change the selected text in each of the rows that your block covers. This is especially practical to remove a column. Just select the column, press d and voilà.