Having students complete a few quick questions on how they are doing is a great way to keep your finger on the pulse of your classroom.  Even very young students can be taught to choose an emoji to represent how they are feeling.  This can be a quick entry ticket in your classroom or something they will fill out only when they need you to know something. 

Students want to know how they perform on a test as soon as they finish.  Using Google Forms to grade their answers is a great way to speed up this feedback process for multiple choice questions.  You'll still need to issue credit for longer written responses, but it can definitely shorten the time it takes to get through them!   

Gamify your Forms using response validation.  Students have to enter the correct response before they can turn it in.  It's a great way to move the focus from getting done quickly to getting it right.  It's also a great way for students to collaborate and work through a productive struggle.  

Giving students a voice in your classroom can be a powerful tool for student buy-in and assist in their reflections!  Students can complete feedback about their performance on an activity or assignment, how their group collaborated together, or even what worked best for them on the way the unit was taught.