Seems that a "Back to Top" button is helpful and useful — especially for mobile sites.
However, on websites that want to come across as "classy", it may sound a little primitive.
Personally, I believe that instructions should be clear, as should buttons — so nothing like:
"Click Thy Cursor Here to Return to the Commencement of this Web Document"
So meeting half way, what are good, intuitive alternatives to "Back to Top"?