Earlier quoted context omitted.
I just change the brightness of the monitor twice a day.
...buried 2 or 3 menu layers deep, using a magic sequence of three buttons to handle all the up-down/left-right multi-level hierarchical menu navigation complexities. One of Apple's biggest innovations imho was to make brightness +/- two of the default keyboard buttons. Every keyboard should replace their F-keys with brightness by default (seriously, who uses F-keys? It's wasted real estate.) TV's should do this too.…
I'm sorry, what?
I use them all the time. F5 for refreshing all kinds of stuff, or for setting breakpoints in my IDE. F7, F8, F9 for controlling the debugger, other combinations for building/running. F12 for opening developer tools in the browser. Some programs still use F1 for help. F2 in Windows explorer for renaming things. And so on and so forth.
I can't stand keyboards without function keys, or where you have to press Fn to activate them.