The 3-key combinations I find particularly annoying are Step into/Step over, Toggle form/unit view, View Object Inspector, View Units and View Forms. In Delphi/Lazarus on Windows the first three are 1-key, while the other two are 2-key. Debugging keys are essential and very common to use; I can't believe you have to hit 3 keys for every single line of code, same applies to Form/Unit view.
In Delphi they are F9, Tab and Shift+Tab respectively (Delphi versions previous to XE 2 need CnWizards for code block indentation). They are shorter and more intuitive.
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