For everyone who has "the film never spooled" issues, you need to watch your rewind knobs when you advance. Don't close the back until the film has done atleast one full rotation too. Was that extra frame worth the zero recorded shots of a mis-loaded roll?
It's very simple. Spool the film, close the back, expose, advance, take out slack from rewind knob, expose, did the knob move? Continue. Did the knob sit there? Don't pass go.
In my Rolleiflex, Yashica Mat and Ikonta, I run the leader around the takeup spool one full revolution, just as you say but, then, I hold my thumb against the spool and put tension on the leader as I turn the crank/knob and advance to the start position.
If the leader is securely attached to the takeup spool, it will be able to pull the film through the gate and into the start position even with a fair amount of back tension, supplied by your thumb. The amount of tension the camera would put on the film is less than the tension that you put on manually.
If you survive this acid test, you're good to go. Close the camera and shoot away. If not, rethread and check your work again before proceeding.
With my 35mm cameras, I do similar but I also I make sure that the film is wound around the takeup spool far enough that there is at least one or two sprockets worth of film going over the film counter sprocket. Once the back has closed, it should trap the film onto the sprocket so that it can't fall out of the film path.
Both of the 35mm cameras that I use regularly have a film motion indicator that tells me whether the film is threaded properly and is taking up on the spool. However, I agree with you about checking the rewind knob. Regardless of any other tricks you use or indicators there are on your camera, that knob won't turn if the film isn't being pulled through the camera.