Do you still do the "L" thing with your hands to check left and right?

I often do it even though I usually already know before doing it. It just feels like a habit/sanity check.

No. I’m not sure I ever did. I’ve never thought about it, but don’t most people (adults) generally just remember and/or know intuitively? I don’t think it’s something I need to think about. Just something my brain knows.