A lot of us do
exit tickets. For me, I just take them, sort them into "got it" and "don't got it" piles, glean whatever information I need and then throw them into the trash.
The amount of time vs. amount of information ratio is excellent. Up until now I had only used exit tickets when students were...exiting.
Today, I realized I don't need to wait until the end of the period to do this. I had some notes we needed to take care of. Notes are not really my thing. I'm not so great at them. I give the "copy this down from the board" parts typed up and they annotate, draw pictures, do examples, etc.
Today I was intro'ing the periodic table so I wanted my students to be able to read a chemical formula first. The notes looked like this: