Most people don't, some people do. A small tub is almost like a hide in itself, so the snake might not even need it. It's up to you and your snake. If your snake is super stressed, won't eat, and is constantly in fear..it could probably use a hide to curl up in! If the snake is eating well, strong, growing, calm and just being a good snake, that snake probably doesn't need a hide.

I personally like to give my animals hides because they use them and even when they aren't using them they have the option of going to use them if they experience a high amount of stress. I use larger enclosures than the typical tub set up(my male is in the typical female setup, and he's tiny) and so he does need a good hide to feel safe and secure!