My first car was a 67 VW bug...and I could shift smoothly without engaging the clutch..just by listing to the RPMs
Yes. I had to do that when my clutch went out so I could get home....had to sweat out approaching red lights though...HA
From my first car to my current pick-up truck, I have always driven a manual transmission because I like the feel of "driving" the car and not just mashing on the gas pedal and letting an automatic transmission drive the care for you. It makes me feel much more in control and saves wear on my brakes because I can downshift to slow down instead of stepping on the brake.
We owned a 63 and a 65 Volvos that you could do that with. And when the hydraulic clutches would blow a seal you had to do that. If you had to stop you put it in 2nd and shut the engine off then fired it up when it was time to go. Life was simple then.