This is another personal pet peeve, this time aimed at Microsoft, and in particular their Office applications. I suspect that many people will hold an opposite view.
In my job (and sometimes at home) I often need to copy and paste sections of text or data between different documents or applications. If I use the normal paste command the copied data are inserted using the same formatting as in the original document, which nine time out of ten differs from that in the receiving document. I then have to reformat my document. I know that I can use Edit > Paste > Special... or use a custom shortcut to paste without formatting, but it's a longer route and easy to forget.
There are also several non-Office applications that will take formatted pasted text, and they don't appear to have a Paste > Special... command. In such cases I often have to paste the copied item into a program that doesn't allow formatting (like Notepad) then copy/paste it into the other application. I'd find it easier if the default for the paste command were without formatting. I'd be interested to learn if others have the same issues, although I realise this blog, with its minuscule readership, is not the best place to ask for the opinions of the world at large.