Wholeheartedly agree with you, Kenneth!
I just want to add an example (of which I'm sure that most are familiar, but for those who aren't yet familiar) of how this is implemented on FamilySearch.
On a profile, wherever a profile ID code is given, clicking on it gives a pop-up button which, on clicking, automatically copies a profile ID to your computer's clipboard.
FamilySearch also introduced this feature a while back, and it's made life easier and processes smoother.
It might be helpful to many (at least those logged in) to have the profile ID displayed in text somewhere on the profile, plus a pop-up or mouse-over copy button, similar to what FamilySearch uses. Perhaps it could even be integrated into the profile preview feature.