I love all my keys equally
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Caps Lock is my "push to talk"-button on TeamSpeak, Scroll Lock is part of many personal hotkeys, Pause came in handy when programming, Menu plus the whole Insert, Home, Page up/down, Delete and End block work as media keys, Print Screen for screenshots, Win key for certain hotkeys and bringing up the start menu, Ctrl, Alt and AltGr as modifiers for even more personal hotkeys...
I think the only key I really don't need is the Num Lock key (it's a full size keyboard, so no reason to not use the numpad as, well, a numpad) and maybe some of the F keys, like F7... because while they do have a function and are generally useful, I can never remember what each key does in each program, so I don't use most of them at all