I can't imagine my working life without a touchscreen. Drag to scroll, touch to focus, pinch to zoom, just the usual stuff. I also use business style light laptops, so touch is always there and more usable/precise than the touchpad. People always get confused when they ask me for help on their machines and I reach to the screen for... nothing, usually.
You're probably joking but I actually enjoyed switching between using the mouse and the touch screen, it's a cute little distraction.
> People always get confused when they ask me for help on their machines and I reach to the screen
Nooooo, please don't touch my screen! I can't stand fingerprints on my laptop display! Pretty much every gesture you mentioned has a touch pad equivalent that works just as well or better for a desktop OS.
> Drag to scroll, touch to focus, pinch to zoom, just the usual stuff
I feel like trackpads do most of the above better than a touchscreen? Mac trackpads, at any rate (I do recall a lot of PC trackpads and/or drivers being hot garbage)
You must get a nice arm workout moving your hands from the keyboard to the screen and back all the time. Sounds super slow though.