I've been driving manuals for almost as long (~41 years, only my very first car was a slushbox), and I've always (on VERY steep hills) used the hand brake with the locking button depressed and then used the clutch and gas to hold a little pressure against the hand brake until the light changed, or I got up to the stop sign, then released the brake handle, and the clutch, and hit the accelerator.
I can think of one stop light on top of a 12% hill in Chatham, N.J. where the hill start assist will be most welcome.