I think there’s a notion among teachers of high school students that coloring, scissors, and folding are stuff their kids should have left behind years ago. To them I say “pish posh!” I did a 2 door foldable to highlight how sound waves resonate in closed and open pipes. Helpful, say, if your students are building their own wind instruments.
I know what you’re worried about — foldables take valuable class time that could be better spent. There are ways to speed their creation up. Teachers who use foldables often have names for their favorites (so you can say to your kids, “make a 2 door tabbed foldable”) and names for the folds (such as the famous hamburger fold). I think the time is well spent. My friend Julie Reulbach agrees, saying foldables can “visually slow [students] down”.
Megan Hayes-Golding 
I completely agree with you. While they take a small bit of classtime, I think it provides a much needed “brain-break” for students who have short attention spans. Sometime I struggle with how to reach the kinesthetic learners and foldables provide at least a small connection to them. I also like them because it forces me to really think critically about my notes and focus on what is important.