I've been using Excel for a long time and might even consider myself a power user, so I'm surprised I never came across this tip before: You can toggle a formula view to see all of a spreadsheet's formulas at once by pressing Ctrl+`. That little fleck, in case it's not entirely clear, is a backtick (or, as this site takes way too many paragraphs to explain, a gravé), i.e. the seldom-used character that shares a key with the tilde just to the left of the 1 key on most keyboards. Press Ctrl+` once to show all of your formulas, press it again to switch back to the regular data view.
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