With a smartphone you have to turn it on, swipe your password and/or unlock it somehow, then tap the camera app and then tap/press something to take a picture. And you might get an error message, "Battery too low to use flash."
My dumbphone you press-hold camera button and that's it.
With a generic "smartphone" you do, with an iPhone you just swipe up from the bottom right corner. It's nicely sandboxed outside the lock screen - you can see the photos you just took, but to review other photos you need to enter your PIN.
Sony smartphones work the same way
I have an old OS Blackberry Bold and I use the camera in class to photo student work and email it to a webmail account in-lesson then pop it on projector. I also use music player with 3.5mm lead to play podcasts &c. Fairly quick to use. Students encouraged to photo screens/whiteboards and email them in &c.
As a more mature (cough) person, I make limited personal use of social media and tend not to have very high traffic. The 'smartish' aspect is all data collection.