I must defend Notepad here. I enjoy having a simple text editor included on my machine that doesn’t try correct words or style anything. I often paste text from Word or Google Docs into Notepad, then paste into a WYSIWYG editor simply to remove all the inline span tags and other crust. Comes in handy when training others how to WordPress, for instance. TextEdit, on the other hand, is a rich text editor and gets in the way for this use case.

What's wrong with "the regular old command prompt"? It's served me well for ages.