Back in the day I worked at a gas station and had to go pick up a van. I was just asked if I knew how to drive stick and said sure. It was a little shock to see a 3 on the tree but not a big deal.
I played with a first gen Bronco when I was 15 that had 3 on the tree It was different, but fun. (turned 40 this year) Even though it may not be as efficient or as fast, rowing the gears is fun and I'll be sad when they're gone completely.
When I was growing up, everything was 3 on the tree. I think you could shift that as fast as a floor mounted shifter...only drawback was the linkages would get all loose. Used to beat the crap out my Dad's '64 Dodge Dart with a slant six and 3 OTT.
1961 ford pickup (former fire marshal's truck at Pearl Harbor) was the department's utility vehicle when I was an undergrad. Loved that truck -- we fitted it with three 50 gallon juice barrles and a small Honda pump for a type V (minus) fire rig. Coming back from an Rx burn in the valley, put out a median fire in Vacaville, much to the surprise of the city FD responding to scene a bit late. Shoulda seen the look on their faces...
My Harvester got the point were I had to hold the housing on the column with one hand while I shifted with the other, all while trying to steer the damn thing. Try that with a cell phone in your hand ya wimpy millennials
You had asked how many don't know. The answer would be, all that don't answer. Yeah, three-on-the-tree, whatever. Four-on-the-floor...five, six, seven...ten, twelve, fourteen...who cares? All that matters is, which one can get you out of the ditch after you over-extend the limits of the car's nanny programming? An auto? Not even.
Manuals aren't a problem at all in urban areas when most other cars are manual transmission. Traffic tends to flow better. The problem is when you're surrounded by cars with automatic transmissions. Most people with automatics utilize the Deadfoot Driving Technique: Mash the accelerator pedal until you're going too fast, then mash the brake pedal until you're going too slow. Repeat endlessly. This doesn't cause a big problem on open roads, but in congested areas it turns everything into a lurchy stop-and-go, even when the traffic isn't super-dense. Since the Deadfoot Driving Technique doesn't mesh particularly well with a manual transmission, when the majority of vehicles are manuals you don't get as much of the lurchy driving.
Blipped downshifts in my dad's Z06 are half of the reason I visit my parents these days. I wish I could install a quickshifter for the upshifts though. Stock clutch pedal has way too much travel for me to keep things smooth when the gas is on the floor. I'll be 40 this year and know about and have seen 3 on the tree, but never driven one since they were all lawn ornaments.
Same for me except it was a F100, same age. My first truck a 66 Chevy with a straight 6 250 and a 3 on the tree.
Dad had a 67 C-10 Chevy Step side in which we used to go out on the farm roads and play "SparkPlug and Clutch". That's how I was taught to drive.