For every term of my PhD so far, I have been enrolled in two classes, and sometimes auditing one or more additional classes.
This term, during which I need to complete my formal dissertation proposal, I am planning to take only one. I have completed essentially all of the coursework requirements for the PhD, though I expect to continue taking courses for the duration of the program. One of the nice things about U of T is that it is packed with star professors, and there is nothing to stop anyone who can pass as a student from attending any of their lectures.
Congratulations on your steady progress.